This functionality is already implemented for Control Change messages (not the toggle sort), if you program the looper to use the same CC# but a different value, it will do this. I’ll keep that in mind for program changes though. The only thing tricky about that is that the looper is the only thing keeping track of what program you’re on, and doesn’t really know that the program changes are being routed to a single device in your setup, if that makes sense; so the LED functionality you want may be a hassle for someone who wants to use the PC messages in a different way (with multiple devices for example).
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