When you have a new piece of midi hardware, and want to use it with gdam, you usually follow a simple procedure. Plug the device into /dev/midi, run gdam-launcher, and open the midi selector. Type /dev/midi into the device entry, and press open. Play with the device, and watch which controls produce new events in the event list. Decide what controls are available, what you want to use them for, and what xml is needed to describe this binding.
This is a small drum machine, with 16 drum pads. It has the ability to play back midi tunes, but we're not interested in that. What is useful to us is that the 16 drum pads emit note-on and note-off events, each pad a different note. Furthermore, there is a 'pad bank' button which cycles through sets of pad-to-note bindings. If we carefully program to pad banks so that there are no conflicting note values, we could control 32 or 48 or 64 different events with the unit. When i open the device in the midi selector, and tap the first two drum pads, i get the following new events:
note on, channel 9, c# octave 3, idx=49 note off, channel 9, c# octave 3, idx=49 note on, channel 9, a octave 3, idx=57 note off, channel 9, a octave 3, idx=57 |
I notice that even if i press and hold a drum pad, a release event immediately follows the press event. This is unfortunate because the pads can only be used as event triggers, not as momentary-on buttons. I decide to use the first two pads to seek backwards in a turntable by one and two bars respectively, and to write a binding file which i can source on a set of wheels. From looking at wheels-hotkeys.xml and other input binding files, i know how to make a binding associate with the left turntable of a set of wheels, addressing it by name. The following xml file implements these two bindings.
<Gdam-Binnding-Interface>
<constant type="GdamPacker:tt1">
<argument>seek_by_bars</argument>
<value>-2</value>
<GdamMidiEventNoteOn>
<input_id>9</input_id>
<midi_index>49</midi_index>
<device>/dev/midi</device>
</GdamMidiEventNoteOn>
</constant>
<constant type="GdamPacker:tt1">
<argument>seek_by_bars</argument>
<value>-1</value>
<GdamMidiEventNoteOn>
<input_id>9</input_id>
<midi_index>57</midi_index>
<device>/dev/midi</device>
</GdamMidiEventNoteOn>
</constant>
</Gdam-Binding-Interface>
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This is a full-sized midi controller keyboard with a pitchwheel, an expression lever, and one slider. The slider can be assigned to any parameter value, so it could be reused to control more then one value. The expression lever emits parameter one, and is activated by pressing upwards on the pitch wheel lever. Exercising these controls in gdam-launcher produces the following new events.
note on, channel 0, e octave 4, idx=64 note off, channel 0, e octave 4, idx=64 note on, channel 0, f octave 4, idx=65 note off, channel 0, f octave 4, idx=65 note on, channel 0, f# octave 4, idx=66 note off, channel 0, f# octave 4, idx=66 pitchwheel, channel 0 parameter 1, channel 0 parameter 56, channel 0 |
The keys emit seperate press and release events, so they can be used as momentary-on buttons. I decide to use the first note to mute the gain on the left turntable; when i depress the 'e' key the gain will be muted, and when i release the gain key the volume will be restored. At the same time, I'll have the data slider control the volume of the left turntable. The following xml does the trick:
<Gdam-Binding-Interface>
<range type="GdamPacker:gain1">
<argument>volume</argument>
<min_value>0.0</min_value>
<max_value>2.0</max_value>
<GdamMidiEventParameter>
<input_id>0</input_id>
<parameter>56</parameter>
<device>/dev/midi</device>
</GdamMidiEventParameter>
</range>
<constant type="GdamPacker:gain1">
<argument>muted</argument>
<value>1</value>
<GdamMidiEventNoteOn>
<input_id>0</input_id>
<midi_index>64</midi_index>
<device>/dev/midi</device>
</GdamMidiEventNoteOn>
</constant>
<constant type="GdamPacker:gain1">
<argument>muted</argument>
<value>0</value>
<GdamMidiEventNoteOff>
<input_id>0</input_id>
<midi_index>64</midi_index>
<device>/dev/midi</device>
</GdamMidiEventNoteOff>
</constant>
</Gdam-Binding-Interface>
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I'll also use the pitchwheel with a "bend" filter. The bend filter applies a temporary rate change to a song, with the ability to rewind. The 'wheels' guicomponent doesn't have a bender packed in, so i cannot address it by name. However if i create a bender in the filter stack, i can source the following file to have it follow the pitchwheel. I choose the speeds to range from still to double speed. This puts a rate of 100% in the center. As the pitchwheel is spring-loaded to return to its center, this is convenient.
<Gdam-Binding-Interface>
<range type="GdamBender">
<argument>bend_amount</argument>
<min_value>0</min_value>
<max_value>1</max_value>
<GdamMidiEventPitchWheel>
<input_id>0</input_id>
<device>/dev/midi</device>
</GdamMidiEventPitchWheel>
</range>
</Gdam-Binding-Interface>
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