Background, 02 Wing with Mic mutes installed and JM headsets with PTT passenger switch. AT TIMES, passenger only would lose XT side tone. Everything else worked fine. She could hear everything FM,CB, Ipod etc.Tried switching out cords, switching helmets etc etc and could not pin down problem. Today, both passenger AND Drv had no side tone when PTT switches front and rear were activated. Everuything else works fine. Called Morph today and followed his directions for eliminating problem. Nothing worked, so pulled Mic Mutes off bike completely. Replugged up connectors. Still no side tone on Intercom. Rcv works front and rear on all settings, CB, Ipod, FM, AM, weather Band. When I hit PTT with CB on, it does indicate a switch from Rcv to Xmt. Still no side tone on intercom, both positions. Any suggestions?