I posted the manual for the Akai ME 20A. It is in files>misc. I own one. Let me know what your trying to do and I would be glad to help you out. I know what it is but I am not to familiar with how AVR code works.
A general description of the ME20A is this. You can input 1 of 3 things. A cord, an arpeggio, or a sequence. The dynamics knob adds a sort of "randomize" to the velocity. The Gate knob controls the note length and speed knob is pretty self explanatory. The other 3 main parameters are Up, Down, and Seq Patter modes. Enter a chord and a rest in Chord mode and play in Up Mode it plays up, rests, repeat for the next measure and so on. Playing back in Down mode works the same but goes down of course.
The cool and unique thing about this is the way you input the notes in Pattern mode and play back in Seq Pattern mode. It is not too different then entering a sequence into a Poly 800II. You input Notes, Cords, Rests, and Ties. The best I can describe it without getting into great detail is that it makes assumptions in a way. This is particularly apparent when you use it to enter in more complex patterns. (Such as those on page 12-13 of the manual) It is hard to tell without it in front of you but you don't enter in all those notes. The assumption seems to come in when you use rests in Sequence Pattern mode.
--- In korgpolyex@yahoogroups.com, Gordon JC Pearce <gordon@...> wrote:
>
> Okay, I'll bite. I saw one of these in Sound Control in Glasgow in the
> second-hand stuff a couple of years ago, but didn't buy it.
>
> Am I right in assuming that it basically works like the Poly-800
> sequencer, except it allows you to transpose the programmed sequence
> based on which notes you play?
>
> It can't be hard to make something that does this. If someone can give
> me a good, accurate description of what it all does, I'll have a crack
> at writing some AVR code this weekend.
>
> Gordon MM0YEQ
>