An example of playing two audio buffers at the same time, one in each channel.

gistfile1.js

var synth = flock.synth({
    synthDef: [
        {
            ugen: "flock.ugen.playBuffer",
            buffer: {
                id: "chord",
                url: "../../shared/audio/hillier-first-chord.wav"
            }
        },
        {
            ugen: "flock.ugen.playBuffer",
            buffer: {
                id: "hockey",
                url: "../../shared/audio/hockey.aiff"
            },
            mul: 0.1
        }
    ]
});