Are you wanting to know how to send a program change from the OT to the TR8S? Or just the configuration of it? I had the first question a couple of months ago; how to send a program change from the OT to any other MIDI device. I believe the OT will only send a program change when you change patterns? Or parts? I never did get it %100 sorted out. All I know is that you can’t just program a trig with a program change. It’s set at the pattern level I believe.
The workaround that I found, and have yet to do but I know it works, was to buy a MIDI processing device. Basically, I can take an unused CC and have the MIDI Event Processor change it to a program change message so I can send program changes whenever I want without having to change a pattern/part. There’s a few threads in the OT forum that go over it in better detail that I’ve done with this post though.