I really don't know who the "you" is that will occasionally mess up an audio panel for the headphones in the jumpseat, but it does happen every onece in a while and then occasionally the mess up is missed by others. The FAA will always "listen in" when doing a route check. The potential exists because there are adjustments. Personally, I've only found one panel set incorrectly but I fixed it during the setup flow and channel 9 never transmitted anything but COM 1. To err is humean though, eh?