Question- Don't have failures checked, yet often, but not every time, when I click on the mic, to transmit, I get a left isolated bus fail. Opening up the overhead panel, I can see it's off. I've got my ` key mapped to my suncom throttle, to the radio switch. Why is the left isolated bus failing?Joe

I am not sure, but I had a similar problem using RadarContact a while ago. The solution was to go to the PIC menu, I believe preferences, where you find a lot of PIC specific shortcuts. Maybe you just use the same shortcut with your microfon which shuts down the left bus. (if not, you can nevertheless change or delete the bus assignment)Hope that helps!