noneuclidean v2.1.1

noneuclidean

Multiplatform (Node.js, SparkAR, MaxMSP (node.script)) module for pure polyrhythmic ("noneuclidean") timing of events

Use with Node.js

npm install noneuclidean;
npm install node-wav-player;

In your node app:

const track = require('noneuclidean');
const player = require('node-wav-player');

A track takes one parameter, "beatProb", an array of the relative probability (0.0 - 1.0) that a beat count (index + 1) will be chosen.

Define instruments:

class Instrument    {
    constructor(path) {
        this.path = path;
    }
    play = () => {
        hit(path);
    }
}

"path" is the relative path to a sound file to play.

"hit" is a function to play the sound:

const hit = (path) => {
    player.play({
        path: path,
    }).then(() => {
        // console.log('play start.');
    }).catch((error) => {
        console.error(error);
    });
}

• Create an array of instrument parameters:

instParams = 
['./snd/808_Clap.m4a',
'./snd/808_Closed_HH.m4a',
'./snd/808_Kick_x3.m4a',
'./snd/808_Snare_1.m4a']  

• Create arrays of Instrument & Track objects:

const trackCount = 2;
var instruments = [];
var tracks = [];
for (i = 0; i < trackCount; i++)    {
    let newInstrument = new Instrument(instParams[i][0]);
    instruments.push(newInstrument);
    let newTrack = new track.Track([.33, .33, .33]);
    newTrack.play();   // side effect sets initial track count length without generating note
    tracks.push(newTrack);
}

• Define "beat" to generate pulse, call noneucledean Track.play method, and play instrument:

const beat = () => {
    setInterval(() => {
        for (j = 0; j < trackCount; j++)    {
            if (tracks[j].play() == 1) {
                hit(instruments[j].path);
            };
        }
    }, 250);
}

Finally:

beat();

Use with Max’s node.script object

Open patch maxHost.maxpat. The node.script object loads maxWrapper.js, which requires noneuclidean.

Turn on audio and metronome. Send beatProb list messages to create tracks, bangs to increment pulse.

Use with Spark AR

Unfortunately, Spark AR Studio does not support requiring JS modules. So I pasted the contents of noneuclidean.js into the noneuclidean.arproj script. Sad. It works, though! Send it to SparkAR on your phone, and tap a floor target to start and stop the beat.