Apple Mac Pro Audio Update1.1

That update contents 3 Systemextensions doing the cpu powermanagement ! So not direct Audio driver update. Noies problems seems to be related to the powersaveing up/down steps of the MacPro cpu and maybe fixed ny that as an workaround. But keep an eye on your cpu temp - it may change by that update too (less powersavings by less up/down powerstate stepping in some cases)

Hmm. After updating, my keyboard volume controls only control the Built-in Output now, instead of whatever output is selected (like my Built-in Line Output which I've got the speakers plugged into).

I was experiencing the problem where the CPUs in my Early 2009 "Nehalem" Mac Pro would get hot whenever I played audio, and this update fixed the problem for me! Thank goodness!

This was a recurring topic in the apple mac pro forums, I know this update just made a lot of people happy.