Called Comcast this last week to complain that volume levels between channels is so vastly different that frequently changing channels resulted in volume so low you can't hear it or it blasting you out of the house. Was told by comcast rep that they don't control the volume levels.
As a retired cable plant manager and FCC licensed engineer I can tell you this is totally untrue. Individual channels are brought into the cable "head end" and remodulated on individual modulators.
I am now contacting the FCC to see what can be done about it. Also attempting a FCC complaint under the new CALM act.