Mike, I think you are onto something. I created a new song then tried changing my MIDI patch on the Thru channel and could not. It's stuck on electric jazz guitar. The only clue I received occurred when I tried to use a patch from the higher banks (for my external Roland hardware synth) and I got an error message that this was a COMBO and I had to select a different patch for one of the first three tracks (including piano, bass). But that didn't work either.

I'm reporting this to the developers.

EDIT: I do have a workaround for you. Go to Preferences, Channels. You can see that the Thru Chn (bottom row) is on Channel 5 as you said. Now look at the third column (Patch), bottom row (Thru Chn). Change the number there to change the GM MIDI patch (1 = piano, 33 = acoustic bass, 57=trumpet etc.). The button marked "GM Patches" in the bottom left shows all the codes. That should hold.

Last edited by Matt Finley; 01/11/17 06:57 AM.

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