Device Details
Overview
| Name | Version: | Kasm Ableton WASM Rust - Source Code Example 1.0 |
| Author: | kevleyski |
| Device Type: | MIDI Effect |
| Description: | Manipulating live notes on-the-fly with Rust/WebAssembly (WASM) This is a tutorial only (i.e. not an exciting new plugin) detailing a working example of how to manipulate MIDI data and potentially DSP audio signals using more efficient Rust code in Ableton Live 12.2 w/ Max4Live using WebAssembly in the newly added V8 Javascript engine Features includes: Passing inlet parameters from JS into to Rust Rust code calling Max4Live outlet function (Rust code plays chords offset by semitones pssed in from Max4Live) Max console debug post() messages from inside Rust code How does it work, what does "Kasm" do for me? There are three primary layers working together to enable Rust execution within Max4Live/V8: Rust Code Layer: Your MIDI/Audio DSP logic compiled as WebAssembly JavaScript Bridge Layer: Handles WASM bytecode loading, setups parameter marshalling for Max4Live integration Max4Live Layer: V8 JavaScript engine with an basic example .amxd device showing two way communication with Rust Kasm then provides the base64-encoded WASM binary parts and compiles this as a blob for integration: Base64 Decoding: Custom atob() implementation for Max4Live WASM Compilation: Direct compilation from that decoded binary Function Export: Cahing mapped Rust functions available to JavaScript getStringFromWasm: Convert WASM memory strings into JavaScript strings !! note for this to all work this project needs Ableton 12.2 or later as it utilises the new V8 engine, you'll need Live 12.2 Suite or Standard + Max4Live add-in !! The example contains a heap of code comments, whilst you can figure it out from this it helps if you already know a bit about what WebAssembly is, Javascript and how to compile Rust code Building and updating it is easy: npm install npm run build This updates kasm_WASM_rust.js which then compiles the WASM, you simply copy and paste that into any 'v8' Max4Live object The example .amxd demonstrates the Rust function being called and outlet and debugging messages from Rust code itself kasm_midi_note_offset has two inlets and has one outlet pub fn kasm_midi_note_offset(inlet_0: i32, inlet_1: i32) -> i32 kasm_midi_note_octave_hit shows how to generate chords and triggering MIDI events by calling the outlet() function from inside Rust and also debugging the Rust code into Max4Live console using post() |
Details
| Live Version Used: | 12.2 |
| Max Version Used: | 9.0 |
| Date Added: | Jun 26 2025 03:33:25 |
| Date Last Updated: | Jun 27 2025 07:53:42 |
| Downloads: | 0 |
| Website: | https://kevleyski.gumroad.com/l/kasm_ableton_wasm_rust |
| ⓘ License: | None |
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