Sound differential HD/Commercial

[RANCHERO]

I am using the optical cable from the DCT 6200 to my Technics Digital sound processor, and then to a high end Technics six channel surround sound system. This also has a DVD, VCR, Tape to Tape and Record player inputting as well.The Dolby/Surround/six channel sound from the 6200 is phenomenal and the processor picks up all the slightest background sounds in the HD programming. However, when these shows switch to commercials or voice-overs from the stations, the analog sound comes through at over triple the volume level and we have to quickly mute, and then turn the sound on again when the show restarts. Does anyone have any suggestions? We may have to cancel our HD subscription due to this extreme annoyance, the clarity and high end sound of the HD programming are definitely ruined for the few HD channels out there. Our full package non-HD programming on our old cheaper cable box does not seem to have this problem, still using an optical cable connection.