[sdiy] pitch to voltage

[Nick Liebrecht]

I am planning to create a semi-modular synthesizer for use with the electric
bass guitar.  I know that i will need an envelope follower, preamp, and
pitch to voltage converter.  I had no problem with the first two modules,
but the third has me stumped.  Could anyone point me towards some info on
pitch to voltagge conversion?  I'm looking for schematics and theory.

Thanks,
Nick Liebrecht