DS can be made bit-perfect on XP if all the sliders are set to the max apparently, but it would appear to be impossible on Vista/7: Homebrew CMI 8738 drivers - Hydrogenaudio Forums
Dogbert is not exactly a clown when it comes to windows audio, as he happens to be a highly skilled drivers engineer.
well, Reclock allows you to watch movies in KS/WASAPI exclusive...that's good stuff
Is this what your basing you assumption on:
"the underlying reason for this is that the kernel mixer of vista isn't bitperfect anymore unlike its predecessors from XP and 2000. In vista either kernel streaming (non-WaveRT version) or wasapi (both WaveRT/non-WaveRT versions) is thus required to get bitperfect PCM sound and thus supported."
Do I need to point out what is wrong with that statment?