davedarkoAfter posting, let me quickly remove the SID part and hope no one ever saw it :D Here are some basic samples that are pretty promising, 4 triangle voices on one input, hopefully combinable with I2C. Sounds nice :)
http://www.technoblogy.com/show?QVN
starting point for I2C sound card
A project log for I2C peripherals based on Attiny85 (mostly)
making noise over I2C, or send IR remotes or get an external controller, just stuff that is only helping if you don't have spare pins left
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