I was cogitating on cool sounds for a haunt and I wondered if anyone had used a heartbeat for a subtle background. My thought was to have a normal heart rate at the beginning and have it get faster as you progressed thru. I'm talking about just audible and not overpowering. And of course there would be other sounds too. If all goes according to plan( what plan!) there should be enough distance between that there would no be carry over. Any thoughts?