Just a quick post. My roommate has this small Scosche BoomCAN battery powered speaker. It fits in the palm of my hand, and charges via USB. I've run a few tests with some voice changing patches I created in Audulus a while ago, and it seems like it will do the trick. I plan on working on the mask some this weekend, and I'll be playing with the voice changer throughout next week, so maybe, just maybe, this is coming together nicely! I'm also toying around with making an Arkham Asylum ID badge for Crane. I'll update a little more later this weekend.