Today’s update: a few kinds of outputs set up. First, these yellow lines will carry square waves out from my 12 oscillators to a merged audio signal. I am going to then amplify that signal on its way to a speaker and/or line out jack.
Next: this gruesome mess that looks like a melted Christmas decoration actually maps voltage into my key tuner (i.e., the array of small blue potentiometers) along red wires and back out to ground via green wires.
An equal number of yellow leads (from the wipers) will be sent to buttons affixed beneath plastic piano keys.
The buttons will then carry [monophonic] signals out through these diodes:
This closes the voltage divider, insofar as pressing any one piano key will generate a specific, unique voltage. That specific, unique voltage feeds into the oscillators from the first photo, above.
So, I can begin to show in concept-map-like fashion, from left to right, the signal path of the essential elements of this project. The blue potentiometers act like a ‘bank’ of sounds, and the keys/buttons trigger unique frequencies from that bank which become audible things as they pass through the ICs toward a speaker.