Making good progress thanks to so many on checking the COR, had to use HWINVERT on the COR and now all is well following COR on the Maxtrac receiver. Final problem, I think.. The audio is horrible low on the Maxtrac. I have tried injecting via the microphone port and tried injecting flat tied inside the Maxtrac. If I plug a standard MIC into the mic port the audio is fine, so I am certain the TX Deviation is good. I have been advised there is a TXGAIN setting, but I can only find that for Echolink, not for the port as a whole. What am I missing? My other two BeagleBoards ­ plugged into controllers, I had a POT in the controller I used to bring the audio up where I needed it. Mike kb8zgl