Disklavier

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I've got an audio CD that happens to be a very high quality rendering
of some MIDI files, and I also have the MIDI files themselves.  I'd
like to be able to sync the MIDI file to the CD so that I can play
them back on my MarkIV and have the piano part play acoustically.

The primary reason I want to do this is that the MarkIV's MIDI sounds
are no where near as good as the hardware that was used to render this
MIDI to the audio CD, and the piano part would likely sound better
live than the rendered version (or, at least that's the hope).

I can see from the manual that it will allow me to record a new MIDI
file to sync to the CD (but that doesn't help), but I can't see any
way to tell it that the two are the same thing (of course, I would
probably have to tweak the beginning offset of the two, but I'd be
happy to do that to make this work).  Is this possible?

Short of that, I've begun investigating MID2PianoCD to move the MIDI
onto the CD...but, so far, MID2PianoCD tells me that all of these MIDI
files are invalid (it work's with other MIDI files, and these MIDI
files work on every other piece of software I've tried them with
including cakewalk, winAmp, and the Disklavier itself).

Thoughts?

Thanks.
-Kevin