My Toshiba TV has that feature built-in - they call it "TruVolume". It detects sudden increases in the program's volume, and adjusts accordingly. You can turn t

My Toshiba TV has that feature built-in - they call it "TruVolume". It detects sudden increases in the program's volume, and adjusts accordingly. You can turn the feature on or off. I think it may also turn the volume up when the program's volume goes down.