Thanks, I also tried older versions of VoodooHDA like 2.8.4 etc and same problem.
Post MergedInterestingly if I run the usual bench-marking programs such as xbench, Geekbench, Cinebench, Blackmagic etc all run with results to be expected. Whatever the problem is appears to only effect the audio.
Post MergedFor grins I tried the AppleALC.kext and Lilu.kext and injecting the ALC1150 code and it still did the same thing. It also does it with my USB EMU sound card and it has its own drivers. Same problem on both motherboards which are both ASRock but different models with different audio chipsets.