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Have a look at the above picture and see if you can see an issue? I operate SO2V in contests now, and this shot was taken during the RAC Canada Day contest on July 1. Operating SO2V is new to me, and I am still getting used to things. If you are familiar with the Icom 7610, you may see the issue in the picture. 
Now that you have looked at the picture, let me tell you what I did.....Since I am new to SO2V, I have been trying to get used to VFO A sound in my left ear and VFO B in my right ear. At this time, I had been listening and operating on 15m but just had 20m up on the screen with no audio. Things started to pick up on 20m and drop off on 15m. I then pressed a key on my keyboard (Pause key), and this put me back on 20m and set up N1MM+ to log contacts on 20m. 

The odd thing was I was calling CQ contest on 20m for about 5 minutes and no answers. I could hear a noise floor, but I was not getting any replies to my CQ. Then it clicked, I looked at the radio and forgot to take VFO A off mute! The orange light you see in the picture on the main VFO AF/RF control means the audio is muted for the main VFO. I was hearing VFO B in my right ear but I did not click into that. Who knows how many ops called me, but I just could not hear them as the audio was muted. Live and learn, I guess.