HI - This is with respect to the new Sonar Professional software: I have the rhythm part of the song just the way I want it. The bass sounds right, so do the background strings and the drums and the guitar, etc. The melody is played as a piano patch. Then I record part B of the melody with a trumpet patch (on a separate track) and it turns out fine, however the bass now plays with the trumpet patch. I checked the bass track in the event view and there is no patch change. Does anybody here know why this is happening? Thanks!
Helmut

What soft synth are you using?

Thank you for your reply! I am using a Yamaha PSR-S970 Digital Work Station (keyboard).

MIDI channels misconfigured so the trumpet MIDI is triggering the bass sound?

Perhaps the PSR can have different instruments respond to a single channel. I don't think this is related to program changes, but probably to MIDI channel assignments.