My guess is what I just realized (about 1yr ago -- been working on a solution.) Stuff is being left DolbyA encoded -- this causes some HF over emphasis because of compression, and some other troubles. A simple tone control doesn't fix the problem -- even though it can mitigate the worst of the disruption. I can/will make a DolbyA SW decoder available for free - it has been demonstrated to be better than a real DolbyA in many ways (esp less intermod.) It still undoes the normal DolbyA intermod effects because of the physically/mathematically necessary behavior, but doesn't have the problems that a FET expander, diode expander (like the early DolbyAs) or most software expanders (due to very primitive/obvious implementations that just don't work well.) If interested -- let me know -- here is a repository with examples (see if they have the problems that you are talking about..) Filenames with -raw are the undecoded material, filenames with DAdecoded or similar are the decoded material. I also have an Aphex Exciter remover and an ABBA example on my repository :-). Site: https://spaces.hightail.com/space/z3H68lAgmJ

I am trying to get the music distributors to straighten up their act and do a proper DolbyA decode operation. In a way, it is probably best that they NOT do a decode, and use a superior decoder (to the hardware), because SW can do it better. (Not a simple, straightforward attack/decay scheme -- can use techniques that minimize intermod except the physically/mathematically necessary problems.) Give the examples a listen...

John