[sdiy] MIDI Note chaining (was MPE)

[Ben Bradley]

"This is easy. You always “steal” the first note and then only echo
the remaining notes. Each subsequent synth does not see the notes
stolen earlier, but proceeds to steal the “first” note that it sees,
and then passes on the rest. Any synth that’s already playing a note
will simply pass on everything until it sees a matching Note Off."

If this is going through the original MIDI protocol (the 5-pin
DIN/serial protocol, and I'm not familiar with how well or badly "MIDI
over USB" is) it's going to be slow - each device has to read two or
three bytes, determine the note is not for them, then retransmit them,
doubling the delay time between each note. The ideal (and expensive,
but if you've already got 16 monosynths, ...) solution is an
in-between device that does the note assignment and has a separate
output port and cable to each monosynth.