Issues with Sonar's MMCSS implementation

Hey everyone!

I have recently been very busy helping RME to fix bugs with their Vista driver implementations, because performance with my main DAW Ableton Live was unuseable when Multiprocessing (MP) was enabled and even without MP performance issues were noticeable with both Live and Reaper. During my course of testing I added the trial of Sonar 7 to my arsenal and came up with some issues around MMCSS that might interest you Sonar user.

This is taken from my reports to RME and Ableton and thus concentrates on Live first. Live has specific problems when using MP support if any of its audio-threads have a different priority than the others. That means that when the ASIO driver's thread is pushed by MMCSS while the other MP threads are not then considerable dropouts occur. Since the issues mentioned in these parts may affect users of all DAWs you might find them interesting, too. The last part explicitely describes issues/bugs with the MMCSS implementation of Sonar (trial) that I have stumbled upon.