Something I've been thinking about for a while so I thought I'd see if there'd be any interest in it.
I've got some cool ideas on how to make quite a smart drum machine on the NES. It would be a 16-step (or less) pattern based thing with simple song structure (just a string of patterns with a repeat count). The cool thing is that on each step you will be able to assign settings for all five NES voices and also on each step you'll be able to modify parameters such as envelope, amplitude, duty, pitch sweep, (simple) table etc. for all five voices simultaneously.
What do you think - any interest?