Well, I built one last night for the scematic I found online, It's pretty cool, my sounds distorted as hell though, going to mod the circuit to try to get some more headroom out of it, and I haven't housed it yet so it sounds a bit weak, been experimenting putting the speaker face down on different boxes, sounds really cool. I'll try to find a way to get a sound sample online if I can but no promises because my soundcard sucks and I don't really have a decent mic, our family SM58 (it's dads but he never uses it so me and my bro share it) is in Wales now coz my bro's been using it.