Figura 4.1. The Main UI in Single Pane mode

The Main UI comes in 2 flavors : the (classic) Single Pane mode (ideal for large- and medium size screens), and the Tabbed mode (optimized for netbook screen sizes).

	Suggeriment
	You can switch between these two modes in the Appearance tab of the Preferences.

Below you can see the main UI split up in 5 parts: the Main Menu, Main Toolbar, Song Editor, Pattern Editor and the Instrument and Sound Library Editor. These sections will be explained in detail further down in this manual.

Figura 4.2. The Main UI in Tabbed mode

Let's start with a little history on the concept of Drumkits within in Hydrogen. It began as a dedicated drum machine but has evolved into a versatile sample-based sound synthesizer/sequencer that is capable of generating and manipulating all sorts of sounds. Hence the original "Drumkit" terminology is slightly misleading. You can load any kind of sound into a "Drumkit" and manipulate that sound just like playing a regular synthesizer. This is also the main reason why the Piano Roll Editor was introduced.

To sum it up, nowadays a Drumkit is a collection of a number of instruments (snare, kick, sampled voice, bass sound ...), using one or more components which each can consist of multiple layered samples.

	Suggeriment
	In case you are not familiar with the world of sound synthesis, you can check out the Glossary for a number of useful definitions.

Instead of playing back programmed patterns Hydrogen can also be used synthesize drum sounds for incoming MIDI or keyboard events.

Using the Input mode in the Options tab of the Main Menu you can choose between two different ways to emulate sound. Drumkit maps different MIDI events and keyboard inputs to different instruments of the current drumkit while Instrument maps them to pitch-shifted samples of the instrument currently selected in the Song Editor. You can think of these modes as input versions of both the Drumkit Editor and the Piano Roll Editor.

Which MIDI input maps to which instrument is depending of the Note parameter in the Instrument Editor set for in each particular drumkit. An example for the GMRockKit is shown in the table below.

	Nota
	In order to process incoming MIDI messages, you have to enable the Use output note as input option and set up the overall MIDI support in the MIDI system tab of the Preferences dialog first.

Alternatively you can use the Virtual keyboard provided in Hydrogen. It maps a number of keys of your computer keyboard to incoming note and allows you to use it as a traditional MIDI keyboard. The mapping is shown in the table as well as in figure below.

	Nota
	Fixa't que el nom de l'instrument depèn del kit de bateria carregat. Aquesta llista es refereix al GMKit carregat per defecte. De totes maneres, la posició de l'instrument és la mateixa.

When adjusting the mapping or creating your own custom drumkit try to follow the General MIDI (GM) standard as accurately as possible. This will ensure that switching between drumkits goes smoothly. You are of course free to place your instruments anywhere in your drumkit, and sometimes it isn't even possible to follow the GM standard, but it makes life a lot easier if you do.

	Nota
	Keep in mind that it is the position of the instrument (within the loaded drumkit) that is linked to a MIDI-note/keyboard-key and not the name of the instrument.

For a better visualization you can also find the mapping notes to your PC's keyboard key in the figure below.

In addition to manually program pattern using mouse and keyboard you can also record one or multiple pattern. You can do so using an external MIDI device, like an e-drum, or use the virtual keyboard provided by Hydrogen.

In order to start recording, first activate the record button in the Main Toolbar and afterwards press the button located right next to it (like in a classical tape recorder).

Using the playback mode of the Song Editor you can choose between the following two scenarios. When in Pattern mode all inserted notes will be added to pattern currently selected in the Sidebar of the Song Editor. When, on the other hand, in Song mode the input notes will be added to the active pattern (the one the playhead is located in and is currently used for playback). If several patterns are selected in a single row, the input notes will only be added to the pattern at the bottom.

	Nota
	The incoming notes will be added in a non-destructive way. This means when adding two notes at the same position, you will have two notes being played back at once (with double the volume of a single one).

With Session Management you can easily restore complex sessions involving numerous applications including their particular state. Hydrogen does support some Session Management systems too.

	Avís
	All the supported Session Management protocols are Linux only. There is no (tested) support for MacOS and Windows yet.

4.5.1. NSM

Hydrogen will be under session management if you start it via a NSM server application, like Non Session Manager or RaySession. You can easily check whether Hydrogen is aware of the session by checking out the Project option of the Main Menu as some action will have changed in order to comply to the NSM API.

• Replace With New Song: instead of New. Replaces the song associated with the session by an empty one.

• Import Into Session: instead of Open. Replaces the song associated with the session by a song of your choice.

  	Avís
  	In Hydrogen version 1.1 the import into a session is not yet fully supported. While the selected file will be loaded and you can work with it, Hydrogen won't recall it after closing and opening the session. You need to copy the corresponding .h2song file manually into the session folder to make your choice permanent.

• Import Recent Info Session: instead of Open Recent. Replaces the song associated with the session by one of the recently used songs.

  	Avís
  	In Hydrogen version 1.1 the import into a session is not yet fully supported. While the selected file will be loaded and you can work with it, Hydrogen won't recall it after closing and opening the session. You need to copy the corresponding .h2song file manually into the session folder to make your choice permanent.

• Export From Session As: instead of Save As. Stores the song associated with the session at a location of your choice as .h2song file.

  	Nota
  	In contrast to the Save As command the underlying path of the current song will not be changed. All subsequent Save actions will store the current state of the song to the file in the session folder and not to the path of the exported file.

	Nota
	The Open Demo option will be missing.

Both the song and the preferences associated with the session will be stored in a session folder called Hydrogen.*. In addition, the drumkit (and its samples) used with the song will linked into the session folder as well. If the link is replaced by a folder containing a valid drumkit, this one will be used over the system and user drumkits.

	Suggeriment
	This allows you to create fully self sufficient backup of your Hydrogen session using tar -chf. These can be even ported and used to systems which do not have the required drumkits installed.

After installing Hydrogen on your system you can invoke it from the command-line with a number of different options.

        -h, --help                  Displays this help.
        -v, --version               Displays version information.
        -d, --driver <Audiodriver>  Use the selected audio driver (jack, alsa, oss)
        -i, --install <File>        Install a drumkit (*.h2drumkit)
        -n, --nosplash              Hide splash screen
        -p, --playlist <File>       Load a playlist (*.h2playlist) at startup
        -P, --data <Path>           Use an alternate system data path
        -s, --song <File>           Load a song (*.h2song) at startup
        -k, --kit <DrumkitName>     Load a drumkit at startup
        -V, --verbose <Level>       Level, if present, may be None, Error, Warning, Info, Debug or 0xHHHH
      

Figura 5.3. La pestanya del sistema MIDI

Using the table in the lower part of the tab you can associate MIDI actions provided by Hydrogen with incoming MIDI messages. How this is done will be explained in the Secció 16.1.

Figura 5.4. La pestanya del sistema MIDI

The OSC tab (Figura 5.4) let's you modify all options associated with OSC (Open Sound Control) (see chapter OSC API for details).

	Nota
	In order to see and access the Enable OSC feedback and Import port option, Enable OSC support has to be checked first.

	Nota
	If the chosen OSC port is already occupied, Hydrogen will pick an alternative one on startup and displays it via a popup as well as in the OSC tab of the Preferences.

Figura 5.5. La Pestanya d'Aparença

The Appearance tab let's you modify Hydrogen's look and feel.

Projectes: aquest menú ofereix funcions relacionades amb els fitxers.

	Nota
	If you are using Hydrogen within a NSM session, some of the options below will be called and behave differently (see Secció 4.5.1 for details).

This menu offers instruments functions.

Tools mainly for debugging and monitoring Hydrogen.

	Nota
	The Debug option is only available if Hydrogen was compiled with debug support.

Using these buttons you can start (also bound to Space, see Capítol 21 for further related shortcuts) and stop the playback, record new patterns (see Secció 4.4 for details), fast forward and rewind the transport position, and loop playback.

In addition, you can switch between Song mode and Pattern mode.

	Suggeriment
	When using the Keyboard to navigate in the Song Editor and Pattern Editor the shortcut Ctrl + Space (or Alt + Space on MacOS) will change the mode to the one corresponding to the editor. In addition, it will move the current transport position to either the note (Pattern Editor) or the pattern (Song Editor) focused by the cursor and starts the playback.

This section covers how to interactively change tempo using the Beat Counter. Due to conceptional similarities the Tap Tempo will be covered as well which itself is not related to the widget displayed above.

7.2.1. Tap Tempo

The Tap Tempo allows you to change the tempo at any time - with playback rolling or stopped - within Hydrogen. To change the tempo, hit the \ key in the tempo you want.

After two keystrokes the tempo will be first changed according to the time difference between the two taps. With each addition keystroke the tempo will be changed again to the rolling average value of the last up top eight hits of the \ button. If you tap accidentally, or if you wait too long between taps, the Tap Tempo counter will start over.

	Nota
	The widget shown above is the one of the Beat Counter. The Tap Tempo itself does neither have a dedicated widget nor any option to be set by the user.

7.2.2. Beat Counter

Polsar Tempo és una part del ComptadorDePolsacions, que és essencialment un polsar tempo tunejat. Per defecte el ComptadorDePolsacions no eś visible. Per veure el ComptadorDePolsacions clica el botó de dalt a la dreta (BC) entre el selector de mode Cançó/Patró i el selector de PPM. També pot veure's quan es pressiona la tecla coma (,).

El tempo que pressionis serà considerat polsacions parelles del tipus de polsació. El tipus de polsació pot ser configurat a 1/8 (per ritmes d'un vuitè de nota), 1/4 (per ritmes d'un quart de nota), 1/2 (per ritmes de mitja nota) i 1/1 (per ritmes d'una nota sencera). Per cambiar el tipus de ritme utilitza la tecla fletxa esquerra. Per cambiar el nombre de polsacions comptades, utilitza la tecla fletxa dreta. Pots configurar de 2 a 16 polsacions (P.e., si configures les polsacions a 6, hauràs de polsar 6 vegades abans que el nou tempo estigui computat i s'assigni.) Mentre es mostri una R per pantalla el ComptadorDePatrons està apunt per començar de 0. Cada vegada que pressiones amb la tecla coma, mostrarà el nombre de polsacions que has entrat (1, 2, 3...).

El botó del fons a ma dreta controla la funcionalitat començar-automàticament, i s'activa entre S i P. P significa (Reproduïr), en aquest estat la cançó assignarà el tempo automàticament i es començarà a reproduïr quan hagis entrat la quantitat correcta de polsacions (si no s'està ja reproduïnt, clar). D'aquesta manera, si tens el ComptadorDePatrons configurat a 4/4, pots polsar 1-2-3-4, i començar en la pròxima polsació. Quan es mostra S (per Configura PPM), l'auto inici està deshabilitat.

Per exemple: suposem que estàs en un grup, Hydrogen, i tens un sintetitzador software controlat per Seq24)... i vols que tot comenci alhora. Configura el tipus de ritme a 1/4 i el nombre de polsacions a 4. Habilita l'auto-inici (mostrant P). Compta al grup 1-2-3-4 (mentre li vas donant a la coma) - i tothom comença a l'1.

Un altre exemple: En la mateixa situació, però la cançó no requereix d'Hydrogen o sintetitzadors fins a una estona després. Mentrestant, un humà (p.e. el guitarrista) anirà configurant el tempo. En la mesura anterior en la que hydrogen se suposa que ha de començar, polsa la coma 1-2-3-4 amb el ritme... i ja ho tens a la pròxima polsació (amb el tempo correcte).

	Suggeriment
	An temporal offset when starting the playback after setting the tempo and a latency compensation for the Beat Counter can be configured in the General tab of the Preferences Dialog.

	Nota
	If you are using JACK transport in the presence of an external JACK Timebase Master, Hydrogen is supposed to be a slave and both Tap Tempo and Beat Counter will be disabled. If Hydrogen itself is the JACK Transport Master, tempo changes from Hydrogen will be broadcasted to other JACK clients.

Set the speed of the song in the range from 10 to 400 bpm (beats per minute).

	Suggeriment
	You can use the mouse wheel to decrease and increase the value of this widget.

Amés, pots posar noves polsacions clicant a , el que habilita entrada directe a partir d'events MIDI o teclat segóns el mapa tecla=instrument:

	Suggeriment
	The volume of the metronome can be adjusted in the Audio tab of the Preferences.

If either Rubber Band support is compiled into your current version of Hydrogen or correctly configured in the General tab of the Preferences, you will also find the button next to the BPM widget. Activating it will enable recalculation of all sample pitches using Rubber Band whenever the tempo of the song will be changed (see Secció 12.2 for details.

The CPU bargraph gives you an indication of the CPU load. The MIDI led lights up every time Hydrogen receives a MIDI message.

	Suggeriment
	The MIDI settings can be adjusted in the MIDI tab of the Preferences.

Clicking will enable JACK transport. If disabled, Hydrogen will still use the JACK driver and registered audio ports. But it decouples its own transport state from the one of the JACK server and will not be in sync with other clients anymore.

Using Hydrogen can be registered as JACK Timebase Master and will send additional information, like the current speed, to other JACK clients. Else it will either act as slave in the presence of another Timebase Master, like Ardour, or as a stand-alone client in the absence of a Master.

	Suggeriment
	You can check whether Hydrogen is in slave mode by hovering over the disabled Beat Counter or Timeline.

	Nota
	The support of JACK Timebase can disabled in the Audio tab of the Preferences. This can be useful in the presence of a fault Master broadcasting nuisance information.

Toggles the Mixer window and the Instrument Rack (containing both the Instrument Editor and the Sound Library).

The LCD screen below displays what Hydrogen is up to and gives an optical feedback of the parameters set in the Mixer.

The Song Editor has two different interaction modes. The default Select mode allows pattern blocks to be set, cleared, selected, moved and copied. The Draw mode instead allows pattern sequences to be drawn freehand.

In both modes, you can perform basic editing: clicking an empty square activates the pattern in that time slot, and clicking again will deactivate it.

They keyboard can also be used for editing. The arrow keys ↑|↓|←|→ will move the keyboard input cursor, and pressing Return will activate or deactivate the pattern in the current column.

In addition, there are two major playback modes, Song mode and Pattern mode, with two minor submodes, Single Pattern mode (covered in the Pattern mode section), and Stacked mode. These will determine which parts of the song you will listen too during playback.

	Nota
	While Select mode, Draw mode, Single Pattern mode, and Stacked mode are activated via the Main Controls of the Song Editor, Song mode and Pattern mode are activated via the Transport Control section of the Main Toolbar.

8.2.2. Habilitar Mode Dibuix.

This mode allows you to insert patterns by drawing - holding the left button while moving the mouse - blocks on the song canvas.

Clicking a square on the song canvas will add a pattern (the square will turn blue) and clicking it again will remove it. Holding the mouse button down will continue either adding or removing patterns from under the mouse cursor.

Using the arrow keys on the keyboard, and the Return, will also add and remove patterns from the song.

	Nota
	The keyboard input cursor is usually hidden unless you press one of the keys listed in Capítol 3. You can alter this default behavior in the General tab of the Preferences.

8.2.3. Editor de Cançons

When Song mode is selected Hydrogen will play the sequence of patterns you have created in the Song Editor from left to right until it reaches the end of the song.

	Suggeriment
	By enabling Loop mode in the transport control, the playback will move seamlessly to the beginning again after reaching the end of the song.

8.2.4. Estableix Mode Patró/Cançó

When Pattern mode is selected Hydrogen will play the pattern that is currently selected in the Song Editor and displayed in the Pattern Editor. This usual behavior is also called Single Pattern mode.

	Suggeriment
	By enabling Loop mode in the transport control, the playback will move seamlessly to the beginning again after reaching the end of the pattern.

8.2.5. Stacked Mode

Normally when composing a pattern and editing it, you'll listen to that single pattern looping over and over again while working on it. Sometimes, however, it's useful to hear that pattern in the context of other patterns (for example, other instrument parts) while working on it.

Stacked mode will play multiple patterns simultaneously, on a loop. You can select which patterns play using Ctrl + left click on the pattern's name. Selected patterns are all marked with a triangle.

	Nota
	Hydrogen's playback mode must be set to Pattern rather than Song for Stacked mode to take effect.

The Sidebar of the Song Editor allows you to interact with and arrange the patterns of your song.

Left-clicking selects a pattern, double-clicking allows you to rename a pattern, drag-and-dropping allows you to rearrange the patterns, and right-clicking will show you a menu where you can change a number of things:

Figura 8.2. L'Editor de Patrons

The majority of songs consist of several parts (intro, verse, chorus ...) and often these parts will have a different tempo. Hydrogen provides an easy way to let you change the tempo of a song at any given moment in the song. This is done by adding Tempo Markers to your song.

To add a Tempo Marker you first need to show the Timeline by clicking the button at the bottom of the Song Editor or via the View element of the Main Menu and enable it using the button. Once this is done the horizontal bar next to the button changes to a ruler with marks at every bar. Now simply left-click this ruler at the bar you want the tempo to change and a window will pop up where you can enter the new tempo.

	Nota
	Please note that the ruler will not be available while using the JACK transport in slave mode (see Secció 7.5 for details.

Once you have entered the new tempo and clicked OK, the tempo change will show up on the Timeline. If you click the Tempo Marker again you can edit the tempo, change the bar or delete it.

In addition to altering the tempo when the song switches from e.g. the intro into a verse, it is also very handy to have a clear indication of more general changes or special events in the song. For this purpose you can also add Tags to the song. These Tags are short text messages you can add at any given moment that will be displayed whenever the song playhead passes by that Tag.

To add a Tag middle-click on the song ruler (just below the Timeline) and a window will pop up that allows you to add text for any bar.

Figura 8.4. Dialog Window for Adding Tags

Once you are done you will see a small blue T in the song ruler for every Tag you have entered. Middle-click anywhere on the song ruler to edit the tags.

Using the Playback Track you can program your song alongside an existing audio file, for example a guitar track.

	Nota
	When a Playback Track is loaded, it will be played back every time audio transport in Hydrogen is rolling and Song mode is activated.

To add a playback track to your song, you need to enable the playback track view. This can be done by either pressing the button left to the scroll bar at the bottom of the Song Editor or via the View element of the Main Menu.

Left to the wave display, the controls of the Playback Track are displayed.

	Nota
	In its current implementation the Playback Track does hide the song ruler used for navigation. It is therefore advised to hide the Playback Track again once you are done setting the sound file and adjusting its volume.

Figura 8.5. The Automation Path Widget

The Automation Path allows you to control the overall velocity of all notes throughout the song. It can be viewed using the shortcut Alt + A or via the View option of the Main Menu.

Clicking the graph area introduces a new point determining when and to which value the velocity will be changed. Currently only linear interpolations of the velocity between the individual points are supported. You can drag a point to move it and you can delete one by dragging another point over it and "absorbing" it.

	Nota
	Whether the Automation Path is hidden or shown does not affect its activation state. It is always active and can't be disabled. But in its default setting it won't alter anything. In its current implementation you have to reset the Automation Path to its original state manually in order to disable it.

Figura 9.4. L'Editor de Patrons

Right of the Sidebar area you can see your selected pattern and add notes for any instrument. The simplest way to create a pattern is by adding notes using Fill notes. Where you can add notes depends on the used pattern size and resolution.

If you are using Hydrogen as a pure 'drum' you just want Hydrogen to 'hit' the instrument wherever there's a 'dot' in the pattern. If you are using Hydrogen as an 'instrument', the length of the note becomes very important. There are 2 ways to define the length of a note :

(Figure above, from left>right : a 'normal' note, a note in 'note length' mode, a note in 'note off' mode)

As in the Song Editor, the arrow keys can also be used to move around the pattern, and notes can be placed or removed with Return (see Capítol 3).

Notes can be selected by dragging over them with the mouse (or Shift + ↑|↓|←|→), and can be deleted with Delete, or moved by dragging (or Return followed by ↑|↓|←|→ movements) the notes to a new location. This allows notes to be moved between different instruments, or to adjust their timing. Movement in the horizontal direction is constrained by the currently selected grid resolution, however this can be overridden by holding down Alt while moving notes.

Moving a selection of notes with Ctrl held down will copy them to the new location rather than moving, as in the Song Editor.

Selected notes can also be copied to the clipboard with Ctrl + C, and pasted with Ctrl + V. When pasting, the relative positions of the input cursor at the time of the Copy and Paste operation will set the new position of pasted notes.

So far we have only used the mouse or keyboard editing to create a pattern, but you can also record your beats. This is probably a more musical way of creating a pattern, but it's up to you to decide what works best for you.

	Suggeriment
	Also see Capítol 18 for a basic walk-through of how the Pattern Editor works.

Figura 9.5. The Note Properties Ruler set to Velocity

Clicking on an instrument or adding/removing a note associated will select this instrument. Once an instrument is selected all note properties of its notes will be shown in the form of vertical lines in the bottom window. The lines represent the values for the selected property of each note of the selected instrument. You can select a different note-property from the note property drop-down list (located bottom-left).

Els controladors disponibles són els següents:

Clicking or dragging the value lines in the Note Properties Editor will set the property value. But often you'll want to set the properties of several notes at once, so there are a few ways to do this.

Figura 9.7. L'Editor de Patrons

The Pattern Editor can be used as Piano Roll Editor pressing the Input button.

While the Drumkit Editor focuses on using Hydrogen as a drum machine, you can also use it an instrument via the Piano Roll Editor. It gives you a complete 'piano keyboard' so you can easily put down your tunes.

You can compare the Piano mode to the NoteKey property in the Note Properties Editor. Only here you have a complete piano keyboard, so you don't have to select the octave first.

	Nota
	When entering multiple notes in one column - as a chord - the corresponding symbol in the Drumkit Editor will be prepended with e.g. a 3x to indicate the presence of three separate notes. Also, to adjust the note properties of the individual notes within a chord can be done by right-clicking on the note and dragging the mouse up or down.

The list of drumkits comprises both the kits present at system level and the ones at user level.

Això llista els kits de bateria que estàn instalats en el teu administrador de sistema. Està determinat per un prefix en temps de compilació. En sistemes operatius tipus-unix això és normalment /usr/share/hydrogen/data/drumkits, o possiblement /usr/local/share/hydrogen/data/drumkits. Aquests kits estàn disponibles per tots els usuaris del sistema, i els usuaris normalment no poden afegir-n'hi.

	Suggeriment
	You can still modify those kids by saving a tweaked version as a user level kit.

The User drumkits are those which you can manage yourself. They are stored in the Hydrogen data directory (usually $HOME/.hydrogen/data/) within the drumkits folder. When you have created a new drumkit via New in the Drumkit option of the Main Menu, you can save it using Save As from the same menu. In addition, you can also Online Import a number of drumkits provided by the dev team of Hydrogen.

Avís

If you are using Hydrogen for commercial purposes, (creating songs and selling these online or in any other way) you need to pay special attention to the license type of the drumkit(s) you are using. If the exact license is not available for a drumkit, do not assume that it is a Creative Commons (CC) or other open and free license. Even if the kit is CC licensed you should always check with the author before using the kit in your songs. DISCLAIMER : Hydrogen is not responsible for the drumkits that are made available for download by our users, either via the hydrogen-music.org or via any other channel.

Per a carregar un kit de bateria des d'aqui, clica amb el botó dret al kit de bateria i selecciona Carregar. Això canviarà el kit de bateria actual amb el que hagis seleccionat. Per carregar un sol instrument del kit, clica amb el botò esquerre mes cap a l'esquerra del nom del kit de bateria per mostrar tots els instruments. Amb el botó esquerre del ratolí, clica i arrossega l'instrument al kit actual. L'instrument serà afegit al kit de bateria que hagis carregat.

Per desar les cançons a la Llibreria de Sò, posa-les al directori de dades sotta la carpeta cançons (normalment $HOME/data/songs). Per esborrar-les, esborra el fitxer del directori.

Per desar les cançons a la Llibreria de Sò, posa-les al directori de dades sotta la carpeta cançons (normalment $HOME/data/songs). Per esborrar-les, esborra el fitxer del directori.

Assegura't d'etitar les propietats clicant amb el botó dret i seleccionant Propietats abans de desar els teus patrons preferits a la llibreria de sò. Aquí li potd donar títol i categoria al patró. Pots utilitzar alguna de les categories predeterminades o crear-ne una de nova simplement escrivint el seu nom. El nom de la categoria és important, ja que els patrons es desen per categoria a la Llibreria de Sò.

When clicking the General button in the Instrument Editor you can adjust several parameters that apply to the particular instrument (and all its layers) selected in the Sidebar of the Pattern Editor.

	Nota
	It's important that you understand Drumkit Concepts and a couple of basic concepts of sound synthesis described in the Glossary in order to continue on. To ease reading, several of the latter concepts are linked in the text.

11.1.1. Paràmetres d'Envolupant

When a note associated with this instrument is triggered, its volume is run through an ADSR Envelope. Its particular settings can be adjusted using the envelope parameters located right below the instrument name.

• Atac- la quantitat de temps que el volum de la mostra triga a anar de 0 al volum de velocitat màxima. Si el valor es 0, la mostra es reproduirà inmediatament a velocitat màxima. Si el valor és 1.0, el volum de la mostra farà servir el temps màxim disponible per al paràmetre d'atac.

• Decay- la quantitat de temps per al volum de la mostra a anar de velocitat màxima fins al nivell de volum de sustain. Si el valor és 0, la mostra evitarà el volum d'atac i anirà directament al nivell de sustain. Si el valor és 1.0, el volum de la mostra utilitzarà el màxim de temps disponible per al paràmetre decay.

• Sustain- el volum al que es tocarà la nota un cop la fase de decay s'ha acabat, i fins que la nota es deixa anar. Si està a 0 la nota serà silenciosa. Si està a 1.0, la nota es tocarà a velotitat màxima.

• Release- el temps d'atenuar la nota des del nivell de sustain a silenci. Si està a 0, la nota s'atenuarà en el valor mínim de temps (mes o menys, 5 ms.). Si està a 1, s'atenuarà durant la major quantitat de temps disponible.

	Nota
	Els paràmetres d'atac, decay i release es configuren tots a partir del nombre de mostres d'àudio. Això significa que el temps canvia segons la freqüència de mostreig de la teva tarja de sò. El màxim de temps és 100.000 mostres d'àucio (típicament, 2,27 segons a 44.1 kHz).

Si la mostra és més curta que els temps especificats, la mostra acabarà, sigui quina sigui la fase de l'ADSR en que es trobi. Si la nota està en sustain, no dibuixa la nota mentre l'estàs aguantant. Només aguanta el paràmetre guany (volum) durant aquest temps.

11.1.2. Guany i Enmudir Grup

The Gain adjusts the overall volume of all samples associated with this Instrument. This Gain is applied in addition to the one you set for each layer and before the one that is set in the Instrument Channel Strips. If the set to 0, the instrument will be silent. If the Gain is 1.0, the volume of the samples will not be adjusted. If the Gain is set higher, the samples will be amplified.

	Avís
	És molt fàcil posar el Guany massa alt, provocant que la mostra es saturi. Recorda provar el guany a velocitat màxima. Si satures la senyal aqui, serà pitjor quan Hydrogen ho processi.

Hydrogen proporciona més grups per a enmudir dels que sabràs què fer-hi (cap a 256). Un grup per enmudir és una agrupació d'instruments que són mutualment exclusius - només un instrument pot estar-se tocant en un determinat moment. Si un s'està tocant i un altre instrument d'aquest grup és disparat, serà inmediatament silenciat (mut) i començarà a tocar-se l'altre instrument. És útil, sobretot per a instruments com ara el charles en els que el sò obert i el sò tancat són instruments diferents.

Si el grup d'enmudiment està Desactivat, l'instrument no és una part de cap grup d'enmudiment. Si el grup d'enmudiment està activat a qualsevol nombre, aleshores aquest és el grup al que l'instrument està assignat. Per posar altres instruments en el mateix sac, selecciona que el seu grup d'enmudiment tingui el mateix nombre. (Per exemple, per agrupar tots els charles, pots posar-los el seu grup d'enmudiment a 1. Per tenir la caixa dins d'un altre grup, posa el seu grup a 2.)

If the Auto-Stop-Note box is checked, Hydrogen will immediately stop any playing samples belonging to this instrument whenever the instrument is re-triggered, e.g. by another note.

This option is particularly useful when you are using long samples like a crash or some existing audio that you have sampled (like a looped voice in a dance/electro song). For the crash you will need to use the Auto Stop-Note when you are sequencing multiple notes in fast succession and want to make it sound realistic. If you do not check this option the cymbal will start to sound like multiple cymbals instead of only one (since the sample of each individual hit will be played completely). For the voice sample this option is useful if you are trying to get that 'stuttering' effect.

The Apply Velocity box lets the user decide whether Hydrogen should apply the note velocity to the sample being played.

	Suggeriment
	The note velocity can set it the Note Properties Editor.

When activated, Hydrogen will apply the note velocity to the sample gain in addition to the layer gain, the instrument gain, the component gain, or the instrument volume. If all the layer samples are normalized, this option should be used.

	Nota
	By default this option will be selected as this is the way older versions of Hydrogen used to work.

When not activated, the note velocity will only be used to select the sample to be played, but the sample gain itself will not be changed. This is useful for set of samples that already have their gain "hard-coded".

11.1.3. Paràmetres d'Envolupant

El filtre és un filtre passa-baixos ressonant. Si no vols fer-lo servir, clica BYPass per a que es posi el botó vermell. Si no està vermell, el filtre està actiu. El paràmetre cutoff ajusta la freqüència de tall pel filtre. El paràmetre de ressonància ajusta com ressonarà la freqüència de tall. Si la ressonància està a 0, el filtre és un simple passa-baixos.

	Nota
	La freqüència de tall del filtre varia amb la freqüència de mostreig de la teva tarja de sò. El rang del botó (de 0 a 1.0) està optimitzat per a una freqüència de mostreig de 48.000 kHz.

11.1.4. Paràmetres d'Instruments

The first two knobs control the pitch shift offset. You can use it to change the tuning of the instrument. Pitch is the Coarse control and has quantized steps of half-tones from -24 to +24. Fine is the Fine control and has quantized steps of cents of half-tones from -0.50 to +0.50.

The Random parameter allows you to randomly vary the pitch of the sample every time it is triggered. The value is set between 0 and 1.0.

	Nota
	The pitch change is fairly small, almost always between ±1 half-steps ⨉ value. Using this sparingly can help your sequences to sound more like a real drummer.

11.1.5. MIDI Out Settings

Hydrogen is capable of generating MIDI messages that you can use to trigger any external MIDI device or application. To do this, you simply need to configure the MIDI output Channel and Note for every instrument. You need to have a sample loaded (an empty WAV file is fine) and make sure the proper MIDI routing/wiring is in place and you're set. As you can see this is a very flexible approach that enables you to trigger samples or sounds from multiple devices and/or apps.

From now on every time a note is played for that instrument (in the Hydrogen sequencer) a MIDI message will be sent to your external app/device and trigger a sound. This way you can use Hydrogen as a pure sequencer for other apps, or combine the internal Hydrogen sampler with multiple external apps/devices.

	Nota
	By enabling Use output note as input in the MIDI system tab of the Preferences dialog the number specified in the Note field will also be used to associate the current instrument with the corresponding incoming MIDI messages.

11.1.6. Hi-Hat Pressure Group

The hi-hat is a particular instrument of the drumkit as its sound can be changed by pressing the foot pedal.

For e-drum owners, the hi-hat pressure group enables to group different hi-hat instruments together, for example closed, half closed, fully open.

Pressure Group: you can assign more instruments to the same group. You can create many groups. For example one group for the different opening levels of a hi-hat when playing the top of it, another group when playing the edge. Another example: timpanis - create a group for each timpani and the pressure will change the note.

Range: set the minimum and maximum pressure for each instrument. Each instrument of a given group should seat in its own separate pressure range. The range will decide at what pressure level the instrument will be played. For example, if your closed hi-hat has range from 0 to 20, when the hi-hat pedal is pressed between 0 and 20 the closed hi-hat is played.

Figura 11.2. Creant Instruments i Capes

When clicking the Layers button in the Instrument Editor you can adjust the samples and synthesizer parameters of the particular layers of the instrument selected in the Sidebar of the Pattern Editor.

11.2.1. Components

Right below the General and Layers button you find the name of the currently selected component. In the drop down menu accessible by pressing you find a list of all components available in the current drumkit and can select them via a left click. Below a separator you can also find three options to add a new component, delete the current one, or rename the current one.

	Avís
	The components are shared by all instruments. This means deleting it will delete it including all associated layers from a all instruments and not just the currently selected one.

11.2.2. Capa

Figura 11.3. The Layer Section of the Instrument Editor

Next you find a listing of all layers of the current component in the selected instrument. The wave form of the sample loaded to the currently selected layer (the one enclosed by a red rectangle) is displayed below.

	Nota
	Empty layers will be displayed as < - >.

El botó (escoltar noves notes) reprodueix la mostra com s'ha afegit al patró. Finalment pots moure un instument amunt i avall amb els botons . La útil funció «Quantitzar» està disponible activant . D'aquesta manera les polsacions insertada respectaràn automàticament respectant la resolució de la parrilla.

	Suggeriment
	Alternatively you can also double-click the wave display to open the Sample Editor.

Nota

When loading a sample it will per-default have its active area set to the whole velocity range. By checking the Set auto velocity option all layers will be assigned an equally sized velocity range corresponding to their layer number (the top-most layer will have a range starting a zero velocity and the bottom-most one that ends at maximum velocity). Note however that this option will overwrite all existing velocity ranges.

Above the layer listing you find boxes in different shades of grey indicating which range of note velocity will trigger which sample (left: 0 velocity, right: maximum velocity). Left-clicking on any of these boxes will play back the sound of associated sample modulated by the velocity corresponding to the horizontal position of the mouse cursor.

	Suggeriment
	This will be quite handy when adjusting the velocity ranges of the layers.

You might have already noticed in the picture above or for shipped drumkits in the Hydrogen GUI that a layer row contains a light blue rectangle that those not quite fill the whole row. This rectangle indicates the range in velocity the associated sample should be triggered. This way you can separate samples for soft hits, regular hits, and so on for each instrument (component). Whenever two rectangles do overlap a triggered note with a velocity within this shared range will consult the Sample Selection to determine which sample will be played back. You can adjust the velocity ranges of each layer by left-clicking the left or right end of the light blue rectangles and dragging it to the desired position.

	Nota
	If there is a(n accidental) hole between two adjacent velocity ranges, the layer closest to the triggered velocity will be used.

11.2.3. Sample Selection

Having a set of samples containing different sample versions of similar sound for the same note velocity is a good way to make your drumkit sound more natural. After all, drummers for example never hit the drum set twice the exact same way.

Hydrogen tries to emulate this behavior by providing multiple layers with overlapping velocity ranges. How the selection of the resulting sample will take place is for you to decide using the Sample Sel. dropdown menu at the bottom of the Instrument Editor.

• First in Velocity: will select the first sample available in the velocity set - the one of the layer most further down in the layer listing.

  	Nota
  	This is the way previous versions of Hydrogen were working.

• Round Robin: will cycle through the different samples one after another as note a in the same velocity range are played.

• Random: will select a random sample inside the velocity range for each note played.

11.2.4. Controls

• Layer Gain: adds Gain for the currently selected layer and the associated sample.

• Component Volume: adjusts the volume of all layers within the current component with respect to the ones of the other instruments.

  	Suggeriment
  	The resulting audio from all layers of each instrument associated with a certain component can be controlled via its Component Channel Strip in the Mixer.

• Pitch: adjusts the pitch of the currently selected layer and the associated sample in quantized steps of half-tones from -24 to +24.

• Fine: adjusts the pitch of the currently selected layer and the associated sample in quantized steps of cents of half-tones from -0.50 to +0.50.

Figura 12.2. The Wave Display Section of the Sample Editor

In the larger (left) wave display you can see the wave form of the sample you are about to edit. In there you can set the start, stop, and loop point for the sample by dragging the the 3 markers:

	Suggeriment
	You can easily move one of the markers by grabbing them close to the letter that marks them.

Underneath you can find a numerical display of the position set for the individual markers as well as some further options. The position of the markers is expressed in number of frames from the very beginning of the sample.

	Nota
	These values will change if you drag the markers, but you can also fine-tune the marker position by using the up/down arrows of the spinboxes, the up/down keys on your keyboard, or by using your mouse scroll wheel while hovering above the spinboxes.

Whenever you move one of the markers you will see a detail view of the position of that marker on the smaller (right) wave display on the right, making it easy to find the zero-crossings in the sample. This detail window also has a slider next to it that allows you to zoom in and out on the vertical axis. Think of it as a sort of volume 'zoom'.

	Suggeriment
	If you want to hear a preview of the tweaking you have done so far, you first need to press the Apply Changes and then the Play button (both at the bottom of the window) to hear the result.

Figura 12.3. The Pitch Shifting Section of the Playlist Editor

This section of the Sample Editor allows you to use Rubber Band - a tool that can change the tempo of a sample without changing the sample's pitch (and vice versa) - to tweak your sample.

Nota

These options are only available if Rubber Band support was either compiled into Hydrogen or was properly configures in the General tab of the Preferences. After installing Rubber Band you should check if the path to the rubberband cli is configured correctly (see Secció 5.1). If neither is the case, all associated widgets will be disabled. When Sample length to beat is set to off the whole Rubber Band functionality will be disabled.

Figura 12.4. The Envelope Section of the Sample Editor

The bottom part of the Sample Editor features some basic controls and the Envelope Editor.

Using the Envelope Editor you can fine-tune both the volume and panorama (pan) of your sample. This is done by creating envelopes by

	Nota
	The volume envelope is blue and the pan envelope is yellow.

Figura 13.3. The Component Channel Strip in the Mixer

Right of the Instrument Channel Strips there additional strips corresponding to the instrument components.

	Nota
	These channels will not be exposed as JACK output ports when enabling the Create per-instrument outputs option in the Preferences.

Figura 13.4. The FX Rack in the Mixer

Amés, pots posar noves polsacions clicant a , el que habilita entrada directe a partir d'events MIDI o teclat segóns el mapa tecla=instrument:

It has 4 bays where you can load a LADSPA effect plugin, but before you can load any plugins these must be installed on system-level.

There are dozens of plugins available for download from various sources:

	Matar Plugins
	Un plugin LADSPA és codi executable, compilat. Pot penjar, petar, congelar, saturar buffers i fins i tot telefonar a casa. Si comences a tenir problemes amb l'Hydrogen, desactiva els plugins i mira si el problema millora. Alguns plugins no estan dissenyats per a ser utilitzats en temps real, i alguns simplement son millors que altres.

Amés, pots posar noves polsacions clicant a , el que habilita entrada directe a partir d'events MIDI o teclat segóns el mapa tecla=instrument:

Now the FX selector window will pop up :

Figura 13.5. Select an Effect

Once you have selected a plugin you will immediately have access to its parameters:

You can select another plugin by clicking the Select FX button. If you quickly want to enable/disable the effect click the Deactivate button (or the Bypass ( ) button in the FX Rack).

	Suggeriment
	This can be handy for a quick A/B comparison.

After you have selected the FX and tweaked it's parameters you can use the Return knob to increase/decrease how much of this FX will be returned to the master output.

Figura 13.6. The Master Fader Strip in the Mixer

The Master Fader Strip contains the Master volume fader with volume unit (VU) meter representing the signal level, and three global humanization settings.

Using the fader you can control the volume of the resulting audio output of Hydrogen which is the sum of all the individual Instrument Channel Strips, the Playback Track, and the Metronome. The button mutes the whole output.

On the bottom-right of the Master section the button will show or hide the FX Rack, and the button will enable or disable the VU meters in both the Master Fader Strip and all the individual Instrument Channel Strips and Component Channel Strips.

13.4.1. Humanization

In order to make the resulting audio sound more natural and less artificial, Hydrogen does offer some humanization capabilities.

	Suggeriment
	Further humanization capabilities are provided via Random Pitch Shift Parameter in the Instrument Editor. In contrast to the global nature of the humanization in the Master Fader Strip this random pitch will only be applied to notes associated with the corresponding instrument.

• Velocity: adds a certain randomness to the note velocity set in the Note Properties Editor. The higher you turn this knob, the bigger will be the randomness.

• Timing: adds a certain randomness to the note timing set in the Note Properties Editor (as Lead/Lag). The higher you turn this knob, the more the timing will be randomized.

  	Nota
  	Notes are displaced in time but the pattern duration or BPM do not change.

• Swing: this knob will add a certain amount of swing to the song. Swing (a slight time delay) is applied to upbeat 16th-notes, and not to 8th-notes as it happens in traditional Jazz.

	Nota
	In technical terms both for the Velocity and the Timing a random number will be sampled independently and identically distributed from a Gaussian distribution. The associated knobs provide a linear scaling of the variance of the underlying distribution.

13.4.2. Mixer Settings

In the upper right corner of Master Fader Strip there is a small "cog" icon button:

Click it to open the Mixer Settings window:

Here you can select the Pan Law used by Hydrogen Mixer.

The Pan Law is the relationship between the Resultant Pan and the separate gains of left and right audio outputs. The aim is to control the horizontal angle the sound seems to arrive from.

Hydrogen features one the most customizable and accurate Pan Law set.

You will find four categories: linear, polar, ratio, quadratic. Every category gives a different "scale" or "sensibility" to the pan knob: the same knob position will make the sound appear more lateral or central depending on the category, from the most lateral (linear) to the most central (quadratic).

Then for each category you will find four options, that define a constraint between the gains of the two channels:

• Balance Law (0dB): when you turn the pan knob from center to right, the right gain stays constant at maximum level while the left gain decreases from the maximum level to 0 (and symmetrically turning from center to left).

  It is ideal for balancing a DUAL-channel track. It has ZERO center compensation: the sound will be louder when the pan knob is at center - unless channels are out of phase - so you may have to readjust the volume manually with the mixer fader.

• Constant Power (-3dB): the total power (which is proportional to the square of the gain) is constant for any position of the pan knob.

  Compared to the Balance Law, each channel gain is divided by the square root of 2 when the pan knob is at center (-3.0103 dB center compensation). In a common room, this constraint may give the general perception of uniform volume for any pan knob position (panning a MONO track).

• Constant Sum (-6dB): the sum of left and right gains is constant for any position of the pan knob.

  This constraint preserves the mix volumes in mono export. Compared to the Balance Law, each channel gain is halved (-6.0206 dB) when the pan knob is at center. If you are in an ideal anechoic room (where there are no acoustic reflections) and you seat perfectly at the same distance from the speakers, with this constraint the volume will be really constant for any pan position, because of the linear super-position of sound waves (panning a MONO track).

• Constant k-Norm (Custom dB center compensation): you can experiment adjusting the center compensation to your taste!

  	Suggeriment
  	Some hi-end studio mixers - to be used in well tuned rooms - have center compensation between -3dB and -6dB.

The four constraints should not change the perception of the stereo angle, but the volume only (depending on the pan knob).

The Pan Law is something you should choose before starting the mix and keep untouched. Hydrogen sets the ratio Balance Law by default because it was the only available law until version 1.0 (so old songs and drumkits will sound the same). The setting is saved in the song file but not in preferences, so it is NOT remembered when you create a new song.

	Nota
	Unlike in advanced mixers, Hydrogen panning makes no distinction if a track is mono or dual-channel (stereo). You cannot pan each channel of stereo tracks separately, nor use a balance law for them and another pan law for mono tracks. If the drumkit you are using is made of true stereo samples, you don't want a negative center compensation probably, so you should select a Balance Law.

Figura 16.1. MIDI Actions are set in MIDI System tab of the Preferences Dialog

An MIDI Event is an incoming MIDI message, originating from e.g. a MIDI controller or an external sequencer. A MIDI Action is a function built into Hydrogen that can be used to react to a specific MIDI Event. Binding an Event to an Action can be done using the MIDI System tab of the Preferences.

You can also define MIDI bindings by simply pressing the button left of the Event-Action binding line. A popup will inform you that Hydrogen is waiting for your input. Press/hit/turn the key/pad/knob on your MIDI keyboard (or controller) that you want to link to this action. The popup will close and the Event Param. value will now show the MIDI note value of the key you pressed. Once this is done you can select an Action from the action drop-down list.

	Suggeriment
	Amés, pots posar noves polsacions clicant a , el que habilita entrada directe a partir d'events MIDI o teclat segóns el mapa tecla=instrument:

The Action Param. column to the right of the table specifies the input parameter to the Action (see the corresponding Actions reference for details).

16.1.2. Actions

	Nota
	Some of the MIDI Actions require that the Action Param. is configured. This parameter usually references a specific channel, instrument, FXsend... Keep in mind that its value is zero-based. So, if you want to reference channel 1 you have to enter 0 in the Action Param. field (1 for channel 2, 2 for channel 3, and so on).

• <<_PREVIOUS_BAR: moves the playhead to the previous pattern/bar.

• ALSA: El controlador d'àudio més extès en Linux

• BEATCOUNTER: calculates the average time passing between successive encounters of this commands and uses it to set the current tempo using the Beat Counter.

• BPM_CC_RELATIVE: changes the tempo relative to the current tempo, using a controller. Using the Action Param you can specify by how much the current tempo will change. If the incoming Event is -1 (negative), the tempo will be increased and if it's 1 (positive), it will be increased.

  	Nota
  	This Action will have no effect if Hydrogen is both in Song mode and the Timeline is activated.

• BPM_DECR: decreases the current tempo by the supplied value.

  	Nota
  	This Action will have no effect if Hydrogen is in Song mode or Timeline is activated.

• BPM_FINE_CC_RELATIVE: as BPM_CC_RELATIVE but with changes 100 times smaller than the value specified in Action Param.

  	Nota
  	This Action will have no effect if Hydrogen is in Song mode or Timeline is activated.

• BPM_INCR: increases the current tempo by the supplied value.

  	Nota
  	This Action will have no effect if Hydrogen is in Song mode or Timeline is activated.

• EFFECTx_LEVEL_ABSOLUTE: changes the volume level of an FX x provided as an integer between 0 and 127. The value you enter in the Action Param determines the Instrument Channel Strip the Action will be applied to.

• [CTRL + O] = Obrir fitxer

• FILTER_CUTOFF_LEVEL_ABSOLUTE: for a value of 0 it sets the Filter Cutoff of the instrument strip specified using the Action Param to 0. For all other values it sets the cutoff to the provided number divided by 127.0.

• MASTER_VOLUME_ABSOLUTE: sets the Master output volume to the value provided by the MIDI event times 1.5 and divided by 127.

• MASTER_VOLUME_RELATIVE: changes the Master output volume, relative to its current setting. For a value of 0 it sets the volume of the master fader to 0. For a value of 1 it increases its volume by 0.05 and for all other values it decreases it by 0.05. (-1: -0.05 , 0: 0 ,1: +0.05)

• MUTE: mutes the Master output (sequencer keeps running).

• MUTE_TOGGLE: toggles the muting of the Master output (sequencer keeps running).

• PAN_ABSOLUTE: changes the pan of an instrument determined by the Action Param to the absolute value - from 0 to 127 - that the linked controller sends to Hydrogen.

• PAN_RELATIVE: changes the pan of an instrument determined by the Action Param relative to the current value. For a value of 1 it increase the pan by 0.05. For all other values it decreases it by 0.05. (-1: -0.05 , 1: +0.05).

• [CTRL + S] = Desar fitxer

• [CTRL + O] = Obrir fitxer

• PLAY/PAUSE_TOGGLE: works the same as PLAY if the playback has not started yet and same as. PAUSE otherwise. (The playhead will not return to the start of the song, but will stay at its current position).

• PLAY/STOP_TOGGLE: works the same as PLAY if the playback has not started yet and same as. STOP otherwise.

• PLAYLIST_NEXT_SONG: opens the song in the current playlist corresponding to the song number specified in Action Param.

• PLAYLIST_PREV_SONG: opens the previous song in the current playlist.

• PLAYLIST_SONG: opens the next song in the current playlist.

• RECORD/STROBE_TOGGLE: toggles recording (same as pressing the record button in the main toolbar).

• RECORD_EXIT: deactivates recording.

• RECORD_READY: toggles recording (same as pressing the record button in the main toolbar) if the playback has not started yet.

• RECORD_STROBE: activates recording.

• Projectes: aquest menú ofereix funcions relacionades amb els fitxers.

• SELECT_AND_PLAY_PATTERN: works as SELECT_NEXT_PATTERN combined with PLAY.

• SELECT_INSTRUMENT: selects the instrument in the drumkit corresponding to the number supplied in the incoming MIDI Event.

• SELECT_NEXT_PATTERN: switches to the pattern specified in Action Param.

  	Nota
  	If Hydrogen is in Song mode, the command will have no effect.

• SELECT_NEXT_PATTERN_CC_ABSOLUTE: like SELECT_NEXT_PATTERN but only take effect in Stacked mode.

• SELECT_NEXT_PATTERN_RELATIVE: switches Action Param patterns forward.

  	Nota
  	This Action does only increment the pattern number and will only take effect if Hydrogen is in Stacked mode.

• SELECT_ONLY_NEXT_PATTERN: clears the list of patterns scheduled to be played next and adds the one specified in Action Param.

  	Nota
  	If either Song mode or Stacked mode is activated, this action will have no effect.

• [Backspace] = Reinicia cançó o patró des de l'inici

• STRIP_MUTE_TOGGLE: mutes the instrument specified in Action Param.

• STRIP_SOLO_TOGGLE: mutes the instrument specified in Action Param.

• STRIP_VOLUME_ABSOLUTE: see MASTER_VOLUME_ABSOLUTE, but applies to the Instrument Channel Strip specified in Action Param.

• STRIP_VOLUME_RELATIVE: see MASTER_VOLUME_RELATIVE, but applies to the Instrument Channel Strip specified in Action Param.

• TAP_TEMPO: another command calculating the average time passing between successive encounters of this commands and uses it to set the current tempo using Tap Tempo.

• [CTRL + O] = Obrir fitxer

• [CTRL + O] = Obrir fitxer

• UNMUTE: unmutes the Master output (sequencer keeps running).

Apart from the dedicated MIDI Actions a lot of GUI elements, such as faders or knobs, can also be controlled via MIDI messages. To configure an element to listen for incoming MIDI Events, press Shift while left-clicking it. A 'Waiting for MIDI input...' popup informs you that Hydrogen is now waiting for you to press a key or turn/move a controller on your MIDI device.

	Nota
	If the element that does not support MIDI automation, a different popup will inform you.

Hydrogen is able to receive and send OSC messages. This allows you to control it using various devices, like hardware OSC controllers, smartphones, tablets, or any PC. For Linux-based systems you can use or test these interactions using the command line program oscsend.

         $ oscsend localhost 9000 /Hydrogen/NEW_SONG s /tmp/new.h2song
       

	Nota
	To enable OSC support in Hydrogen, open the OSC tab in the Preferences dialog. Make sure that the "Enable OSC support" checkbox is activated, otherwise Hydrogen will not listen for incoming OSC messages.

	Suggeriment
	Hydrogen's port number defaults to 9000 for historical reasons. Since this is also the number used in the coding examples provided by liblo package, you may encounter other applications trying to register the same port (which is not possible). In order to avoid hiccups in your audio setup, it's advised to set a different default port in such cases.

Avís

oscsend should only be used for sparse interactive testing and control via a command-line. Using it in scripts is not recommended since every time it sends a command it will registers a new client at the OSC server. If the Enable OSC feedback option in the OSC tab of the Preferences dialog is checked, Hydrogen will send its current state to all registered clients causing it to become slower and slower with every oscsend command sent. Soon you will experience visual lags. When unchecking this option, however, using oscsend is fine.

Hydrogen has two main modes: Pattern mode and Song mode. When Pattern mode is activated the current pattern is continuously repeated. This mode is very well suited to tweak your pattern until it's just right, since the pattern you are working on is constantly repeated. This way you can immediately hear the changes you have made. In Song mode the whole song is played. This is useful when putting together the patterns to create the structure of the song.

We'll start from the empty song with an empty pattern created when Hydrogen starts up: Pattern mode should be selected by default. Now let's click on the button in the Main Toolbar, and while the pattern is playing let's add notes by left-clicking in the grid of the Pattern Editor (see Figura 18.1). Adjust the grid resolution and tempo if needed.

Nota

Remember some constraints of the grid: if you are working with a resolution of 1/16, you can't go back to 1/8 and remove a 16th note; same thing happens if you are working with a resolution of 1/8 and you try to insert a note in the middle of two bars (looking for a 16 bars precision): they will be placed on the previous or on the following 8th bar (unless you choose off from the Grid Resolution LCD in which case you're free to place notes wherever you prefer). Be sure to select the correct pattern in the Sidebar of the Song Editor before adding notes in the Pattern Editor!

Figura 18.1. L'Editor de Patrons

Una vegada creats els patrons (Figura 18.2), es poden copiar/enganxar/esborrar arrossegant-les amb el ratolí (ha d'estar seleccionat el mode de selecció en l'Editor de Cançons i tenir apretat el botó dret del ratolí per a seleccionar la zona que vols moure o copiar).

Figura 18.2. Inserting Patterns in the Song Sequence

Per descomptat sempre es pot utililtzar la finestra del mesclador, tant mentre estem creant els patrons com quan s'estan reproduïnt.

L'àrea del mesclador (Figura 18.3) es compòn de 32 pistes independents, cada una assignada a un instument, amés d'una "Sortida General" per a ajustar el nivel general de volum de sortida i un botó d'"Efectes" per configurar efectes. Cada línea té 3 botóns ( ), ajust de balanç ( ), el pic màxim actual, l'atenuador de volum i el nom de la pista. Clicant a reproduirà l'instrument, tallant als altres. El botó d'"Enmudir" silencia aquest instrument. El nivell màxim de pic indica el volum màxim al que ha arribat l'instrument; el pic ha d'estar entre 0.0 i 1.0 (a Figura 18.3 pots veure uns quants volums massa alts), si no es distorsionarà produïnt un sò extrany (especialment amb el controlador OSS), en aquest cas és millor baixar el volum; atenció a cada contador.

Figura 18.3. El Mesclador

In this chapter we will show you how to create a complete drumkit. Be sure to have a look at the conceptional design of a drumkit first. Keeping this in mind we will use a top-down approach, so we will start at the Drumkit level and work our way down to the samples.

Els kits de bateria en Hydrogen es creen amb l'Editor d'Instruments. Amb l'editor d'instruments pots carregar mostres, configurar paràmetres d'contorn, configurar el guany i uns quants paràmetres més avançats com ara enmudir grups, filtre de ressonància passa-baixos, aleatorització del tò.

	Suggeriment
	Instead of creating your own drumkit, you can also open or download an existing one.