I have an odd issue with Pro-Logic (I/II) or NEO:6. The volume levels in these modes are much quieter than Dobly Digital, DTS, or Stereo. Is this a feature, or is something wrong? The two inputs I have to the 1070 are my TV (optical) and my computer (coax). Both have the same issue.

I suspect this is a result of matrix decoding steering data from the mains to the center and surrounds (in other words, a feature). Is this occuring when listening to the same source material with the different processing modes applied?

It happens with the same source material using the different modes. I notice the feature at any volume setting (even at a low volume setting of -30db).