From: dhr@hotmail.con   
      
   I got a Yamaha RX-V750 7.1 AV receiver this past weekend. I have it   
   configured for 5.1 surround sound and use an over-the-air television antenna   
   for viewing local programming (no cable). The audio signal I receive from   
   NBC fluctuates significantly, this occurs in programs as well as   
   commercials. An example would be while watching the local news the volume   
   will be at a normal listening level throughout the entire news cast but when   
   the station goes to commercial the sound level drops to a far less audible   
   level for some of the commercials, not all. When the news resumes the sound   
   level returns to normal. It is not limited to commercials only. It drops the   
   sound level for certain programs such as The Tonight Show. When I try to   
   watch The Tonight Show I turn the volume up to a normal listening level but   
   the sound has a muffled quality to it.  I do not have this problem with the   
   other national networks.  Although I have noticed some distinct sound   
   variations on other networks such as background sound is somewhat   
   diminished during some programming as well as commercials,  but certainly   
   not as pronounced as NBC.  I had a Sony 5.1 AV receiver but replaced it with   
   the Yamaha but I did not have this sound trouble with the Sony.  Am I   
   missing something in the setup of the receiver? I've followed the setup   
   guide to balance the speakers using the microphone. I'm using optical cable   
   to connect the television to the receiver. Has anyone else run into this   
   problem? Thank you for any help or advice you might have.   
      
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