Yea, im having the same problem. Fresh install, Fast Computer, No other problems or errors. As far as the sound rendering goes im useing the game defaults. In an older verison of planeshift the PS Setup would allow you to change your sound settings and that fixed my problem in the past but now that you can't change it i don't have a clue.

System specs
Intel 3.4 CPU
Intel High Def Sound System
ATI Radion X700 PCIe
1024 Mb DDR 2