User blog:MisterRandom2/Exorcising demons with a tape recorder?

I have a question: Has it ever been stated why the Winchesters and other Hunters don't just carry a tape recorder with the Exorcism chant pre-recorded on it? Does an Exorcism have to be done by a live person in order for it to work? I'm just curious since it seems it would be a lot easier to exorcise a demon if you could just whip out a tape recorder and play it in front of them.

Any thoughts on this?