Well I'm no OS dev, so I will happily defer. But I was under the impression that this would not change the fact that a host audio app is running under user-space and can be pre-empted anytime? The way most pro-audio apps work is they have a callback they run once per audio vector size to fill a buffer of samples for the next buffer to pass to the audio subsystem. So if this gets knocked down the priority list, you get problems. Man I'd love to see any developments to improve that though, on an OS level we've been stalled for 20 FREAKING YEARS now. :-/