Satori

A live coding language for unlimited pattern interference. It supersedes Zen, which was restricted to grid-based event triggering. Satori offers fully flexible timing, and allows parameters from any musical layer to control or transform those of any other. As with Zen, it also includes a simple API for designing, running, and sonifying quantum algorithms via its built-in simulator.

The codebase is modular by design. You can use Satori as a complete live coding environment—combining the core language, editor, console, help docs, and synthesis engine—or import individual modules into your own projects. See the docs below for different use cases. A fully functional version of Satori is hosted at: satori.cephasteom.co.uk.

A fork of the project for exploring Partitioned Quantum Cellular Automata (PQCA) is hosted at satori.cephasteom.co.uk and was generously funded by the folks at Qollab and IonQ.

Local Development

To run this project locally, as a complete application:

• clone this repo
• run nvm use (node version manager) to change node to correct version
• npm i to install dependencies
• npm run dev for hot file reloading
• or npm run build and npm run preview to use bundled package

Using modules

To use Satori in your own applications

import { Satori } from './core/Satori';

// Create a new scheduler instance and pass in event handlers
const satori = new Satori(...);
// evaluate some Satori code
satori.evaluate('...') 

// play / stop
satori.play()
// satori.stop()

Handlers are functions that process events. Each event has an ID (source), parameters, a trigger time, and a flag indicating whether it is a mutation or a regular event.

type Event = {id: string, params: Record<string, any>, time: number, type: 'e' | 'm'};

You can create custom handlers for Satori to connect to your system, or use Satori’s built-in ones.

import { init as initOto } from './oto';
import { handler as midiHandler } from './core/MIDI';

const otoHandler = initOto() // initialise the synth engine and get its handler
const satori = new Satori(
    otoHandler, // Satori now triggers events in Oto
    midiHandler // as well as MIDI
);

To use standalone synth engine (Oto)

You can use the synth engine directly, without the need to write Satori code. Simply initialise Oto, then send your own events via the handler.

import { init } from './oto';

const otoHandler = init()

otoHandler({ id: 'custom', params: {...}, time: 3.5, type: 'e' })

To use standalone patterning language

import { Pattern, methods } from './core/Pattern'

const p = new Pattern()
console.log(p.sine().query(0,1)) // query pattern between 0 and 1 cycles

const { saw } = methods // if you want to nest, get nested methods from methods object
const p2 = new Pattern()
console.log(p2.coin().fast(8).ifelse(
    saw(0,10),
    saw(10,1)
))

To use the standalone code editor

import { init } from './editor'

init('#editor')

window.addEventListener("evaluateCode", (e) => console.log(e.detail.code));

Will load the editor in the element provided by the id. Default is #editor. Listen out for the evaluateCode event to handle the editor output.

To use the standalone console

import { init } from './console';

init('#console')

const channel = new BroadcastChannel('satori');
channel.postMessage({ type: 'info', message: 'a message' } );

Initialise the console, passing in the element in which it should render. Default is #console. Send messages to the console using the BroadcastChannel interface. Types are info, success, and error.

SuperSatori

The internal synth engine Oto is convenient, but its use of RNBO results in a fairly convoluted workflow for adding new synths. Satori also has a Supercollider backend, which sounds great, and is more easily extendable. See https://github.com/cephasteom/supersatori for installation and setup.

Reload Satori, appending ?engine=supersatori to the url. If successful, you should see Supersatori connected printed to the console.

External control via websockets

Incoming and outgoing traffic can be handled by websockets. Use cases:

• You want to send code to Satori from an external source
• You want to send datasets into Satori from an external source
• You want to listen for code changes in Satori and consume them elsewhere

Reload Satori, appending ?ws=true&wsPort=<port> to the url. This instantiates a web socket server on http://localhost:<port>. The port parameter is optional and defaults to 5001.

On evaluate it will broadcast:

{
    code: "...",
    qasm: "...",
    qiskit: "..."
}

See src/core/WebSocket.ts for handing of messages in.

Run node src/tests/websockets.cjs to test the round trip.

Acknowledgements

• This series of blog posts by Froos helped me finally crack time: garten.salat.dev.
• Code editor built with: Prism.
• Mini-language built on: PegJS.
• Quantum simulator built with: Quantum Circuit.