I wonder if that was the case with taking a signal from the Senn's receiver. I tried putting my transmitter for the Senn on mute but that didn't send out anything (so when I hit a string, it wasn't even registering on the Helix). Everything else was exactly the same as when we had rehearsed and played a gig using our own setup and I did not have this issue with the mute being bypassed, it worked the same as it always have.
Next rehearsal we have when I'm with all the gear again I'm going to try some things to maybe see what's up, but if this is a venue/FOH issue is there anything I can do to fix that? Or will it be something I have to look into with the Senn you think?