Howdy folks, Some how or another by changing my fan speed selection I have turned off my sidetone. Since I use the K2 as a CPO most every day this is not a good thing. I have tried changing the sidetone pitch and the sidetone level but neither makes a difference. I still can't hear a thing. I must have done something silly but cannot find it in any of my manuals. Does anyone have an idea? Kevin. KD5ONS