Hi Dan

Thanks for your help! I think (?) it has nothing to do with the channel assignment, as the file is replayed immediately on the SD1, where it doesn't change the volume. (I used the PC's sequencer only to display the file, as I was wondering whether and what types of midi commands were there).
Further I have never changed any channel assignments, unless Rel. 4.0a would have done so.

Brgds from the cold Zurich
Hansruedi