I do not believe that the 1070 can decode this audio, but I'm not exactly sure what the format in question is. The DVD standard is to use either Dolby Digital (any number of channels) or PCM for audio. If the discs are using a different audio format, I'm wondering if the audio output is running into trouble at the player. Are these discs commercial DVD's or DVD-R's? If they're DVD-R's, how have they been mastered?