I found the problem, although I am somewhat mystified. I had set up NWC to use instruments from the General MIDI soundfont. Using MIDIOX, I saw that the patch change messages, and volume and pan messages were being sent when playback started. By setting the instrument to "none" I got rid of my problem. The volume and pan messages are still being sent, but don't matter. Strange thing is that my Hauptwerk stops and pistons are on MIDI channels 5 and 6, and the messages were being sent on channels 1 and 3. Still I don't have the problem any more, and that's good enough for me! Thanks for all the suggestions. Mick Berg.
Hi. I'm using NWC with Hauptwerk, and I'm finding that before NWC starts to play, some of the combination pistons in Hauptwerk are being triggered. Does NWC send any MIDI messages before it starts playing? Thanks, Mick Berg.