I have this adapter uses for my MacBook Pro Retina 15 "with Razor headset. If you know how it works, it works without problems. My headset has a "mute" switch for the microphone when it is activated and you put the adapter in the Macbook, then the micro is not recognized even if you put the switch back to "unmute". => This means you should only plug in the headset when the microphones on (unmute) is, during the operation can be as you want and seem unmuten ..