Doug, I don't have my KX3 connected but I'm pretty sure it works the same as the K3 and that is that the MON levels are separate for SSB and CW Sidetone. So make sure you are in SSB mode and Hold the MON button to advance the gain higher than 0. Give that a try. 73, Mitch NWØM -- Sent from: http://elecraft.365791.n2.nabble.com/