I have an "interesting" problem with the sound on NBC East. Lyngsat shows the sound at 751. I check the sound setting on the receiver and it is set at 751. There is sound when the news person is talking but when they break for the ads the sound is missing on most of them. This is OK when it is one of the obnoxious medical commercials with their sickening side effects. I would rather not hear those, but some of the other ones are worth listening to. I can change the sound to receive the ads but then the news person is silent. Is this normal or do I have something messed up here with my sound?