I know this is an old posting but to anyone reading it for modding advice regarding audio playback, the sparkfun WAV trigger can play multiple sounds tracks simultaneously unlike the mp3 trigger.

I'd love to get into Pi programming. I have a lot of experience with Arduino, used it to control all the coils and additional servo mods on a burnt-out Zizzle POTC machine, but Arduino seems to be an entirely different, more simplistic beast than Pi. I do have plans, someday, of using multiple Arduino's (serially connected) and a WAV Trigger to entirely simulate the Zizzle PCB board. A daunting task indeed that'd probably be a million times easier with Pi.

Since the Zizzle boards are ultra-unobtainium it'd be nice to have an open-sourced Arduino or Pi code ('rom') available so these cool little pins (with toy-grade guaranteed to eventually fail electronics) can be brought back to life with very-obtainable, cheap microcontrollers and a bit of simple soldering.