beepstep baudio track

beepstep.js

var baudio = require('baudio');
var player = require('plucky');

var b = baudio({ rate : 44100 });
var tau = 2 * Math.PI;

b.addChannel(function (t_) {
    if (t_ >= 32 * 4) b.end();
    
    var t = t_ % 0.5;
    var tt = t_ * (t_ % 32 > 16 ? 2 : 1);
    
    return pluck(t, 40, 32, 20)
        + pluck(t, 20 * Math.pow(2, 1/2), 16, 23) * 0.5
        + Math.sin(tau * t * (tt % 2 < 1 ? 180 : 150)) * 0.75
        + Math.sin(tau * t * (tt % 8 >= 6 ? 186 : 183)) * 0.75
        + (t_ % 16 < 8
            ? Math.sin(tau * t * 140)
            : Math.sin(tau * t * (tt % 0.25 < 0.1 ? 0 : 380))
                * Math.min(tt % 0.25, Math.abs(tt % 0.25 - 0.25))
                / 0.25
        )
    ;
});

var music = [
    function (t, clip) {
        if (t > 1) clip.go(0);
        
        var notes = [
            0, 0, 0, 0,
            0, 0, 0, 0,
            100,
            200,
            200 * Math.pow(2,3/5),
            0, 0, 0, 0,
            200 * Math.pow(2,7/5),
            200 * Math.pow(2,5/5),
            0, 0, 0, 0,
            200 * Math.pow(2,11/5),
            100 * Math.pow(2,13/5),
            0, 0, 0, 0
        ];
        var ix = Math.floor(clip.t % notes.length);
        var note = notes[ix];
        
        return Math.min(1, Math.max(-1,
            pluck(t, note, 12, 5) / pluck(t, note + 1/8, 32, 5)
        )) / 8;
    }
];
b.push(1, player(music));

b.push(1, player([
    function (t, clip) {
        if (t >= 1) clip.end();
        return Math.sin(tau * 400 * t * (t % 1 / 8 < 1 / 16));
    },
    function (t, clip) {
        if (t >= 1) clip.go(0);
        return Math.sin(tau * 200 * t * (t % 1 / 8 < 1 / 24))
            + Math.sin(tau * 205)
        ;
    }
]));

if (process.stdout.isTTY) b.play();
else b.pipe(process.stdout);

function pluck (t, freq, duration, steps) {
    var n = duration;
    var scalar = Math.max(0, 0.95 - (t * n) / ((t * n) + 1));
    var sum = 0;
    for (var i = 0; i < steps; i++) {
        sum += Math.sin(tau * t * (freq + i * freq));
    }
    return scalar * sum / 6;
}

Ei!!!!

b.addChannel(function (t_) {
^
TypeError: Object # has no method 'addChannel'