Javascript adapted from http://pastebin.com/d3kiyqp6 in order to create automatic sequences in http://patatap.com it stops automatically after 16 measures

autoPatapatPlayer

var rnd = function( to, from ) {
    return Math.floor( Math.random() * (to - from + 1) + from );
};
 

var triggerKey = function(key) {

    triggerKeyEvent(
        document.getElementsByTagName('body')[0], key
    );
}

var triggerRandomEvent = function() {
     triggerKey (
        rnd(65,90)
        );
}

var triggerKeyEvent = function(el, key) {
    if ( document.createEventObject ) {
        var eventObj = document.createEventObject();
        eventObj.keyCode = key;
        el.fireEvent('onkeydown', eventObj);  
    }
    else if ( document.createEvent ) {
        var eventObj = document.createEvent('Events');
        eventObj.initEvent('keydown', true, true);
        eventObj.which = key;
        el.dispatchEvent(eventObj);
    }
}
 
var tkeKey = 0;
var dubstepBass = 69;
var stab = 69;
var hihat = 77;
var beat = 0;
var measure = 0;
 
var tkeTimer = window.setInterval( function() {

    switch (beat) {
    case 0:

        if (measure == 0) {
          triggerKey(dubstepBass);
          triggerRandomEvent();

        }else {
          triggerKey(stab);
        }
    
        beat++;
    break;
    case 1:
        triggerKey(hihat);
        triggerRandomEvent();
    beat++;
    break;
    case 2:
        if (measure == 0) {
          triggerKey(dubstepBass);
        }else {
          triggerKey(stab);
        }
        beat++;
    break;
    case 3:

        triggerRandomEvent();
        triggerKey(hihat);

    beat = 0;
        if (measure == 1){
            triggerKey(stab);

            measure = 0;
        } else {
            measure++;
        }

    break;
    }

}, 800);

var tkeTimerDoubleTempo = window.setInterval( function() {

    if (measure * beat % 3 == 0 ) {
        triggerRandomEvent();
    }
}, 600);
 
var tkeStop = function() {
    window.clearInterval( tkeTimer );
    window.clearInterval( tkeTimerDoubleTempo );
};