If you’re having a problem using the mute function (or any of the volume functions) on a Mac with a Leitner corded USB or Executive Pro Overture headset, then ask your Customer... DO YOU HAVE FACETIME? Facetime is the ever-popular video chat program for Mac that people love to use inappropriately in public places. But did you know that Facetime has its own sound settings! That’s right! Even if you’re set up for the headset in the Mac System Preferences, you may need to open up FaceTime and change the sound settings there, too. Open up FaceTime. Under the Video menu, change the Output and the Input to the headset. Boom! Volume, mute, and sound should be working as normal now :)