Version 2.0.17 in a 6500. MON function works OK with my Heil Pro 7 and the basic radio/computer configuration. I recently hooked up my iPad Pro to the system with SmartLink and added a Radio Sport RS55SL Headset to the iPad Pro. I can transmit and receive OK with the new setup but the MON function doesn't work. A friend of mine has a similar problem with his 6500 in the basic configuration and an unknown headset. Is there something we haven't configured correctly?