Track with delta

[tjvg91]

My midi tracks with notes on have a delta value on them:

{
	byteIndex: 140
	channel: 2
	delta: 216
	name: "Note on"
	noteName: "D4"
	noteNumber: 62
	running: true
	tick: 2444
	track: 3
	velocity: 0
}

Where do I insert these delta values while playing? It sounds pretty bad as it is. I tried playing midi tracks with delta being all 0 and it sounds perfect. But as it is most of my midi have tracks with delta greater than 0 on them. Pls. help.