Love some of the sounds coming out of this; would be great to get a circuit diagram to get a better idea of how this is hooked up.
Is every output of the decade counter being used or just a single output making it a frequency divider (and other questions)?
If I understand correctly, the Gameboy is running a sequencer, presumably outputting to the speaker, so how is that hooked into the leached information from the various parts of the Gameboy?