Thanks for all the information. We currently watch the TV without the HT on most of the time, because we need to keep the volume down while the kids are studying. Thats why the loud commercials are such a hassle - we have to adjust the volume to the loudest commercials, then you can barely hear the dialog on the TV. I will look for these sound leveling features on the next TV purchase, or maybe a new receiver, or at present one of the electronic boxes pointed out. (I would have to read all the comments to see whats up first).
I am not fast enough with the mute button, because I unually watch TV and go on the internet at the same time.