Ok, instead of taking a midi and work from it, I decided to simulate a midi sequence by just recording R1 with a few chords and runs. Then seq to comp copy to see the results. Interesting...

One does have to know the key/chord for that measure(s) to transpose correctly into the composer. I purposely played using just Chord D/key D, and used 0 for transpose. It didn't match at all. But then I used -2, and the composer part did match.

In another test sequence, I played various key chords, and tried to transpose them over. Did not fair to well. It looks like whatever you want converted must be in the same chord with no changes for the whole set of measures you want to convert over. As you said chord changes would be difficult. One measure at a time.

I don't think it's possible if there are chord changes within the measure using seq to comp copy. So I guess were out of luck in that situation? Unless a third party software is used.

Am I getting to understand this more, or am I still missing the concept?

Anthony