[Angel de Vicente]
I don't know of a MIDI sequencer that offers this (not that I know
many to begin with) but I think it's a really neat idea for tackling
the old problem of "how can I reliably input stuff way beyond my
pianistic abilities and still have it played with a human quality".
To get a quick working prototype, you could use the system commands
arecordmidi and aplaymidi to get the data and use a high-level
language like python with a MIDI file reader/writer module to process.
Since you're only interested in relative timing, it's not a big
problem if you can't get the record and playback clocks to be in
perfect sync when you want to record over the track playing.
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