I installed the Road Tech Bluetooth headset in my HD full face modular helmet to use with my Road Tech Zumo 660.

For the life of me, I can't get the microphone to work properly. I have tried both microphones. I can hear a phone caller and music just fine, but when I try to talk on the phone, the caller can't understand me. My words are muffled or garbled.

Has anyone run up against this and found a fix?

Thanks.