[sdiy] Polyphonic keyboard scanner

[David G. Dixon]

> I will have the boxes brought out so I can look for them. I know I don't
> have them in electronic readable form. Just hard copy.

Terry, I found the schematics (in the form of the service manual) for OB-Xa
here:

http://www.lazyblueoctopus.com/html/oberheim.html

One glance at these was enough to convince me that a microcontroller is the
way to go!  Does the circuit really need to be that complicated to do what
it needs to do?