[sdiy] Polyphonic keyboard scanner

[Oakley Sound]

I cloned and upgraded the Tim Orr ETI Polysynth's polyphonic controller.

 > http://rubidium.dyndns.org/cag/pdf/etipoly.pdf

There are some mistakes in the poly assigner schematic. I have all the 
errors noted down somewhere - as well as a detailed section by section 
break down of what is actually going on. I may try and dig it out if I 
can find it.

Other things to note: Cyclic assignment, like the OB-Xa, with optional 
note stealing and switchable total voice number, 1, 2, 4 or 8. Unusual 
+/-5V buss bar on the keyboard. Linear glide with OTA control.

Tony

www.oakleysound.com