Hey I have a file with 3 guitar plugins connected to a MIDI IN OMNI plugin. Audio signal path is fine but only 1 of the guitar plugins is responding to midi commands. What’s the reason for that?
“Pass unused PC messages” and “use zero-based PC numbers” is active.
What MIDI Commands?
PC messages?
CC Messages?
All PC
So you want switch presets by sending PC messages?
Maybe you need to send correct Bank Messages before the PC message.
Are you aware of this?
How do you do that?
Do you know for certain that the other plugins do in fact respond to program change messages? Many plugins in fact do not.
Yeah ive had times where multiple plugins that have worked before with midi start to not work randomly. I recently just moved everything into its own rackspace and the midi is working perfectly. Ill just consider this problem solved. Thank you everyone!
Yes, I initially suggested that in the FB group.
I’m glad that it worked for you. 
