dart_synth

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# A sandbox for audio synth experimentation in Dart.

The current plan is to create enough infrastructure to run WASM code from [Peter Salomonsens **awesome** AssemblyScript based synth](https://github.com/petersalomonsen/javascriptmusic/tree/master/wasmaudioworklet/synth1/assembly).

## TODO

- [x] Playback using Dart on Linux via Libao (using Pulseaudio on Ubuntu)
- [x] Playback sine wave test tone using AssemblyScript ported to Dart
- [x] Call wasm (AS compiled to wasm from @petersalomonsen repo) from Dart using upcoming wasm package via FFI
- [x] interface to all "low-level" synth1 classes (oscillators, envelope, etc)
- [ ] interface to fx classes
- [ ] interface to "instruments" defined based on lowlevel synth classes

## Example

run to get sawtooth tone at 440hz playing for 1 sec:
```
dart example/osc_example.dart
```

to play a sawtooth tone with a given midi note for 1 sec:
```
dart example/osc_example.dart 33
```

to play a sawtooth tone with a envelope applied for 3 sec:
```
dart example/env_example.dart
```

Note: the wasm oscillator classes currently expect a wasm file called `osc.wasm` to be located in the same folder as the dart script being run, eg. `osc_example.dart`.

## AS Audio WASM

The wasm file [osc.wasm](bin/osc.wab) used by dart-synth comes from the [AssemblyScript Audio project](https://github.com/maks/as-audio).

## Status

Currently only basic sine/sawooth tone playback on x86 Linux (under PulseAudio) works, see above Todo list for planned future features.

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