Here's a demo from a Facebook friend of mine Mark Weeks on his Youtube channel "The Distortion Principle"
He runs it through clean(ish) and dirty channels on three different amps so it's not a short video. ;D
I've got build docs and plenty of boards if anyone is interested in building one for themselves.
Cheers, -Drew
[youtube width=640]v4SAmaUxWgc[/youtube]