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13a4512601
split sysex message into sysexid and sysexdata sysexid is a device identification number or array sysexdata is an array of data to be sent to the device
93 lines
3.1 KiB
Markdown
93 lines
3.1 KiB
Markdown
# @strudel/midi
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This package adds midi functionality to strudel Patterns.
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## Install
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```sh
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npm i @strudel/midi --save
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```
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## Available Controls
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The following MIDI controls are available:
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- `note` - Sends MIDI note messages. Can accept note names (e.g. "c4") or MIDI note numbers (0-127)
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- `midichan` - Sets the MIDI channel (1-16, defaults to 1)
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- `velocity` - Sets note velocity (0-1, defaults to 0.9)
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- `gain` - Modifies velocity by multiplying with it (0-1, defaults to 1)
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- `ccn` - Sets MIDI CC controller number (0-127)
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- `ccv` - Sets MIDI CC value (0-1)
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- `pc` - Sends MIDI program change messages (0-127)
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- `sysex` - Sends MIDI System Exclusive messages (array of bytes 0-255)
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Additional controls can be mapped using the mapping object passed to `.midi()`:
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## Examples
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### midi(outputName?)
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Either connect a midi device or use the IAC Driver (Mac) or Midi Through Port (Linux) for internal midi messages.
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If no outputName is given, it uses the first midi output it finds.
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```javascript
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$: chord("<C^7 A7 Dm7 G7>").voicing().midi()
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```
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In the console, you will see a log of the available MIDI devices as soon as you run the code, e.g. `Midi connected! Using "Midi Through Port-0".`
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### midichan(number)
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Selects the MIDI channel to use. If not used, `.midi` will use channel 1 by default.
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### ccn && ccv
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- `ccn` sets the cc number. Depends on your synths midi mapping
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- `ccv` sets the cc value. normalized from 0 to 1.
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```javascript
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$: note("c a f e").ccn(74).ccv(sine.slow(4)).midi()
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```
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In the above snippet, `ccn` is set to 74, which is the filter cutoff for many synths. `ccv` is controlled by a saw pattern.
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Having everything in one pattern, the `ccv` pattern will be aligned to the note pattern, because the structure comes from the left by default.
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But you can also control cc messages separately like this:
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```javascript
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$: note("c a f e").midi()
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$: ccv(sine.segment(16).slow(4)).ccn(74).midi()
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```
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### pc (Program Change)
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The `pc` control sends MIDI program change messages to switch between different presets/patches on your MIDI device.
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Program change values should be numbers between 0 and 127.
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```javascript
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// Play notes while changing programs
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note("c3 e3 g3").pc("<0 1 2>").midi()
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```
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Program change messages are useful for switching between different instrument sounds or presets during a performance.
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The exact sound that each program number maps to depends on your MIDI device's configuration.
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## sysex (System Exclusive Message)
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The `sysex` control sends MIDI System Exclusive (SysEx) messages to your MIDI device.
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sysEx messages are device-specific commands that allow deeper control over synthesizer parameters.
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The value should be an array of numbers between 0-255 representing the SysEx data bytes.
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```javascript
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// Send a simple SysEx message
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let id = 0x43; //Yamaha
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//let id = "0x00:0x20:0x32"; //Behringer ID can be an array of numbers
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let data = "0x79:0x09:0x11:0x0A:0x00:0x00"; // Set NSX-39 voice to say "Aa"
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note("c d e f e d c").sysex(id, data).midi();
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```
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The exact format of SysEx messages depends on your MIDI device's specification.
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Consult your device's MIDI implementation guide for details on supported SysEx messages. |