On the Kenwood TS-480HX there is a transmit audio monitor that allows you to listen to yourself when transmitting. I'm getting no audio in my headphones when transmitting. It works with the panel connected to the radio. Watching the ALC I appear to be transmitting audio but nothing coming through the headphones on xmit. I tried using the speaker jack on the control head and the speaker jack on the RRC control. RX audio is fine. Everything else appears to be ok and working.