I have made some changes to the schematic I posted this morning. The schematic posted below reflects these changes.
-C1 has been assigned a value of 47uF
-R19 has been removed.
-An unmarked resistor at pin 5 of the op amp has been removed.
The fun starts when you push the IC beyond it’s intended parameters. Drastically lowering the pitch uncovers digital noise and strange blipping effects. I’ve also included a fun audio feedback feature which can be used to create intense distortion as well as interesting octave and pitch tracking effects.
Thanks to Dan Wagoner for sending in a parts list!