Timbre.js

system requirements: Chrome 14- or Firefox 4-

var osc1 = T("osc", "pulse", T("glide", 5, 880), 0.25);
var osc2 = T("osc", "tri"  , T("glide", 5, 880), 0.50);
var vco  = T("+", osc1, osc2);

var env1 = T("adsr", 50, 100, 1, 0, 2000);
var vcf  = T("rlpf", T("+", 2300, env1).kr(), vco);

var env2 = T("adsr", 0, 200, 0.5);
var vca  = T("*", vcf, env2);

var efx1 = T("efx.dist"  , 0, 0, 8000, vca).off();    
var efx2 = T("efx.chorus", efx1);
var efx3 = T("efx.delay" , efx2);

var params = { osc1: { waveform:1, freq:8, fine:0 },
               osc2: { waveform:3, freq:1, fine:0 } };

var score = getScore().split(/\s+/).map(function(x) {
    return (timbre.utils.atom(x) - 12) * 64;
});

var m64tof = function(m64) {
    return 440 * Math.pow(Math.pow(2, (1/(12*64))), m64 - (69*64));
};

var metro = T("interval", timbre.utils.bpm2msec(80, 16), function() {
    var note = score[metro.count % score.length];
    osc1.freq.value = m64tof(note + params.osc1.fine) / params.osc1.freq;
    osc2.freq.value = m64tof(note + params.osc2.fine) / params.osc2.freq;
    env1.bang();
    env2.bang();
});

var ex0 = efx3;
ex0.onbang = function() {
    osc1.freq.value *= 2;
    osc2.freq.value *= 2;
};
ex0.onplay = function() {
    metro.on().bang();
};
ex0.onpause = function() {
    metro.off();
};

ex0.play();