rando.js

var Song = require('nesly-sound')
var song = Song()

var sq1 = song.square1
var sq2 = song.square2
var tri = song.triangle
var noi = song.noise

var time = 1/4
var drumTime = 1/8

function loop(n, fn) {
    for (var i = 0; i <= n; i++) {
        fn();
    }
}

function randNum(min, max) {
    return (Math.floor(Math.random() * (max - min + 1)) + min) - 1
}

var notes = [
    'C2', 'E2', 'G2', 'rest',
    'C3', 'E3', 'G3', 'rest',
    'C4', 'E4', 'G4', 'rest', 
    'C5', 'E5', 'G5', 'rest',
    'C6', 'E6', 'G6', 'rest'
]
var drums = ['rest', '$00', '$02', '$04', 'rest', '$06', '$08', '$0A', 'rest', '$0C', '$0E', '$10', '$12', '$14', 'rest']

sq1(['rest']).duty(25).timing(time)
sq2(['rest']).duty(25).timing(time)
tri(['rest']).timing(time)

function one() {
    var n = randNum(1, notes.length)
    var n2 = randNum(1, notes.length)
    var n3 = randNum(1, notes.length)

    sq1([notes[n]])
    tri([notes[n2]])
    sq2([notes[n3]])
 
    sq1(['rest'])
    tri(['rest'])
    sq2(['rest'])

    var what = randNum(0, 3)
    if (what === 0) {
        two()
    }
}

function two() {
    var time = Date.now() / 1000 | 0
    var d = time.toString().split('')

    d.forEach(function (a) {
        var num = parseInt(a, 10)
        if (drums[num]) {
            if (drums[num] === 'rest') {
                noi([drums[num]]).volumeEnvelope('ve_off')
            } else {
                noi([drums[num]]).volumeEnvelope('ve_drum_decay')
            }
        }
    });
}

loop(10, one)

sq1(['rest']).duty(50)

loop(10, one)

sq1(['rest']).duty(0)

loop(10, one)

sq1(['rest']).duty(-25)

loop(20, one)
loop(10, one)

song.write()
song.done()