Scroll down to discontinued section and y'all find some useful circuits. Look at the index in each manual to see if the circuit is included.
http://www.bbesound.com/support/index.asp
Cool!
I wonder what the BBE IC is...
I'm sure they use proprietry ICs so you probably need a convincing story to extract one from the company - but quite apart from that, there is a great deal of, shall we say, interesting "senior" circuitry in there - none of your 9v stuff! I wonder how much more there is out there on the net, still to be found. It's down to a lucky search phrase.