$(document).ready(function(){
    drumInit(4);
});

function drumInit(count){
    var samples = [];
    for(i = 0; i < count; i++) {
        sample = new Audio('sample-' + i + '.wav');
        samples.push(sample);
    }
    samples[2].volume = .3;
    samples[3].volume = .4;

    $(document).keydown(function(e){
        switch(e.which) {
            case 90:
                samples[0].play();
            break;

            case 88:
                samples[2].play();
            break;

            case 67:
                samples[1].play();
            break;

            case 86:
                samples[3].play();
            break;

            default: return;
        }
        e.preventDefault();
    });
}

case 90:
    samples[0].play();
    if(samples[0].playing) {
        samples[0].pause();
        samples[0].ended;
        samples[0].play();
    }
break;