I wasn't a fan of how the last audio board turned out, so I tried again using an old classic. This board is just five Atari Punk consoles (one per finger). The only alteration is using X,Y control voltages as 555 VCO inputs. Those pins aren't used on the regular Atari Punk circuit.
I also added switches to allow the Z axis video control to be switched off. When the switch is up the line board will not make lines disappear when the finger moves away from the screen. Making "music" means tapping fingers against the screen which produces a flickering mess when the Z axis has such a huge effect on the video output. I plan to redo the video board and use the Z position to change the output in a more subtle way.
I'm not a huge fan of how this circuit turned out either. I get different sounds from fingers in different positions, but they don't behave in a predictable/controllable way. That's just the Atari Punk being an Atari Punk though. It's a noise maker not a musical instrument.