So I've recently opted not to use any of the options in DSP Studio and play everything as-is, letting my A/V receiver handle any kind of volume levelling etc. Everything seems to work fine, until I try to play something mixed at 6.1, during which video and audio will play, but certain aspects of the sound will be lost, depending on the mix. The most obvious problem is dialogue, which comes in very faint, but it does also affect other elements, such as sound effects. It's as if MC is choosing not to output half of the content.
I don't really understand how this can be in a no-DSP setup. It actually happened a few months ago, when trying to watch the imported release of Ghost in the Shell 2: Innocence. At the time, I WAS using some of the DSP settings, and assumed that the problem was in my configuration. I don't really remember how I fixed it, but I can say that, right now, I cannot seem to get the content to play correctly unless I enable Output Format (no output encoding, 7.1 channels, no upmixing or downmixing). Now the same thing is happening when I play the blu-ray extended version of The Lord of the Rings: The Fellowship of the Ring: music is reasonably audible, but dialogue is nearly impossible to hear.
Can anyone else reproduce this?