var SCENE_BLACK = 0;
var SCENE_WHITE = 1;

function strobe(scene1, scene2, subdivision, length) {
    var i = 0;
    var s1e = new NoteOn();
    s1e.pitch =	scene1;
    var s2e = new NoteOn();
    s2e.pitch =	scene2;
    while (i < length) {
	s1e.sendAfterBeats(i);
        i += subDivision;
	s2e.sendAfterBeats(i+1);
    }
}

function fastBlackWhiteFlash() {
    strobe(SCENE_BLACK,	SCENE_WHITE, 1/32.0, 1/4.0);
}