I am having the same issue with an IC-718. I can push “T” and SDRuno will go into [RF MUTE], but I can not get [RF MUTE] to come up when I TX. Very frustrating. I have the .ini file, I can open it and look at it, but I don’t know what to do with it. I have been told it has something to do with that. I’m an ME, not a EE, someone please help.