Kasm C++ Ableton WASM v0.9
Manipulating Ableton Live 12.2 data on-the-fly with C++/WebAssembly!
!! This a more basic version of the Rust version of this SDK - it will get you to a point you could take things further and if a few folks buy it I'll update it - basically if you know Rust go with that version of the SDK instead !!
Some ideas for using the Kasm C++ SDK in Ableton Live:
- Create cool-looking VST wrappers for third-party plugins.
- Hook into WebXR and use AR to control virtual instruments.
- Design smarter X/Y controllers with visual feedback, unlike Ableton’s blank ones.
- Monitor our live performance for trigger patterns to automate things like changing the scene.
- Integrate with pitch detection (autotune) to trigger live events on the mixing desk, adjust monitor levels, set off lighting effects etc.
- MIDI tape loops playback the last half bar repeatedly, applying efficient precompiled algorithms with fade and counterpoint harmony.
- Bangaz hits drum racks algorithmically you might adapt things to your playing style.
- Fill gaps in Ableton Live using your favorite plugins and other DAWs.
The Kasm C++ SDK provides basic examples including Max4Live devices that show how to hook into Ableton.
Since Kasm uses WebAssembly, you can develop and test things in a web browser too. Try it here: (note this example is Rust codebase, but you absolutely can achieve identical results with C++)
https://pyrmontbrewery.com/kasm
Cross platform WebAssembly development includes:
- Instant feedback loops for testing harmonic analysis, chord detection, and algorithmic composition outside Max editor.
- Visual debugging via web browser DevTools and IDEs for performance profiling and memory analysis, unavailable in traditional Max4Live.
- Efficient MIDI manipulation using C++ in Ableton Live 12.2 with Max4Live through WebAssembly in the new V8 JavaScript engine.
Features:
- Pass parameters from JavaScript into C++ and back.
- C++ calling Max4Live outlet functions to play chords offset by semitones.
- Debug messages from C++ appear in Max console.
- Web browser test harness to run Ableton Live WebAssembly in Chrome/Firefox.
How Kasm works with Max4Live/V8:
- C++ code compiled to WebAssembly for MIDI/Audio DSP logic.
- JavaScript bridge layer handles WASM loading and parameter marshalling.
- Max4Live provides jweb and V8 JavaScript engine inside .amxd device for two-way communication with C++/WebAssembly.
Kasm SDK also abstract some nuances around base64-encoded WASM binaries compiled for integration:
- Custom atob() implementation for Max4Live.
- Function export and caching for C++ functions accessible to JavaScript.
- WASM memory string conversions for JavaScript.
- Max console debugging
Building and updating is easy with:
- npm install
- npm run build
This updates kasm_WASM_cpp.js, which compiles the WASM; then paste it into any 'v8' Max4Live object.
Students also receive a 30% discount.
This SDK makes it easy to monitor live MIDI, generate complex note and CC sequences, and create engaging visualizers and animated device backdrops using C++ and WebAssembly.
!! Note: Requires Ableton Live 12.2 or later with V8 engine support (Suite or Standard + Max4Live add-on). !!
C++/WebAssembly/JavaScript source code you can use to build a Ableton Live Max4Live .amxd supporting C++ code