Well, if one replaces the processor, one will have to rewrite all
functions of the 707 OS. Its not possible (AFAIK) to extract the OS
from the MCU since its read-protected, and anyway, that processor is
obsolete and slow.

I probably won't ever have time for this kind of project, but since
this is a 707 list, we can all dream can't we :-) So post your
improvement ideas everybody! :-)

However, I'm thinking more and more that it really would be easier to
just build a new drummachine from scratch :-( Especially with todays
fast microcontrollers where you could probably do all the sample
playback in the controller itself.

BTW, surely somebody must have run a datalogger on the 707 CPU pins

> this would be amazing. i have no idea how to help though. just being
> able to switch patterns in write mode would be a giant leap. midi
> out in write would be great too. 32 step patterns are already easy
> enough with chaining.