When I'm using one controller, the other is plugged in and charging until the battery goes low, then I switch. Only when using 1 of the controllers do I get notifications like I've plugged in a mic. In the top left a window appears with my name, avatar, and battery level, then I get the message 'Microphone switched to USB' or something along those lines. This happens after the controller has been on and in use for a while and I don't even have a mic plugged in.
When in some games, like Diablo 3, it shows me as having not only a mic, but it's on and transmitting. Has anyone seen this devilishness before?
