mid-scripter-lion-and-the-lamb-verse-arp.js

 var events = [];
function HandleMIDI(event) {
	event.trace();
	events.push(event);
	if (events.length === 2 && events[1].pitch !== 74) {
	  schedulePattern(events);
	  events = [];
	} else if (events.length === 3) {
	  schedulePatternB(events);
	  events = [];
	}
}

var bpm = 90;
var sixteenthMs = 60000 / (bpm * 4);

function schedulePattern(events) {
  var one = events[0];
  var five = events[1];
  
  one.sendAfterMilliseconds(0);
  one.sendAfterMilliseconds(sixteenthMs);
  five.sendAfterMilliseconds(sixteenthMs * 2);
  one.sendAfterMilliseconds(sixteenthMs * 3);
  five.sendAfterMilliseconds(sixteenthMs * 4);
  five.sendAfterMilliseconds(sixteenthMs * 5);
  one.sendAfterMilliseconds(sixteenthMs * 6);
  five.sendAfterMilliseconds(sixteenthMs * 7);
  one.sendAfterMilliseconds(sixteenthMs * 8);
  one.sendAfterMilliseconds(sixteenthMs * 9);
  five.sendAfterMilliseconds(sixteenthMs * 10);
  one.sendAfterMilliseconds(sixteenthMs * 11);
  five.sendAfterMilliseconds(sixteenthMs * 12);
  five.sendAfterMilliseconds(sixteenthMs * 13);
  one.sendAfterMilliseconds(sixteenthMs * 14);
  five.sendAfterMilliseconds(sixteenthMs * 15);
}

function schedulePatternB(events) {
  var one = events[0];
  var four = events[1];
  var three = events[2]; // out of order?
  
  one.sendAfterMilliseconds(0);
  three.sendAfterMilliseconds(sixteenthMs);
  four.sendAfterMilliseconds(sixteenthMs * 2);
  one.sendAfterMilliseconds(sixteenthMs * 3);
  four.sendAfterMilliseconds(sixteenthMs * 4);
  four.sendAfterMilliseconds(sixteenthMs * 5);
  one.sendAfterMilliseconds(sixteenthMs * 6);
  four.sendAfterMilliseconds(sixteenthMs * 7);

  one.sendAfterMilliseconds(sixteenthMs * 8);
  three.sendAfterMilliseconds(sixteenthMs * 9);
  four.sendAfterMilliseconds(sixteenthMs * 10);
  one.sendAfterMilliseconds(sixteenthMs * 11);
  four.sendAfterMilliseconds(sixteenthMs * 12);
  four.sendAfterMilliseconds(sixteenthMs * 13);
  one.sendAfterMilliseconds(sixteenthMs * 14);
  four.sendAfterMilliseconds(sixteenthMs * 15);
}