Cgs synth

>
> Hello all! I am new to the group and this is my first post here.
>
> I ran across Mr. Stone's CGS10 pedal board/mini keyboard schematic
> and am impressed with the simplicity of the design. I am wondering if
> this could be used with modification with the scanning matrix and IC
> setups with some inexpensive toy keyboards, i.e., the common three-
> octave Casio/Yamaha types from the 1980's, 1990's and today? It
> appears the CGS10 uses 4-bit binary data output from a 74C922
> converted to a useful voltage by a resistor network? If so, I would
> think some of the toy keyboards contain chips that output binary data
> to the sound generator chips which could substitute for the role of
> the 74C922 in the CGS10. I suspect I would have to find a keyboard
> that had some form of 4-bit binary data output between the scanning
> chip and the sound generator chip, or would other types of binary
> data work with modification?
>
> I have not sat down to examine the full ramifications of this but are
> there any thoughts out there on this idea? Seems to me it might open
> up the usefulness of certain toy keyboards beyond circuit bending.
> Thanks for any comments!
> Todd
>