Sorry for the trouble you are having. Most newer equipment such as A/V Receivers and Processors utilize a little gem called Dolby Volume which takes care of that issue you are having automatically.
That being said, even older equipment, once you dive deeper into their vast menu sections, will have setting provisions for each of your individual inputs, such as.....Tv, cable box, blu-ray, dvd,etc.
Try looking into that and let me know how things turn out.-------------Take Care, Bill Blake