Just to add about the sounds try unchecking the eax box if you are using a headset or only two speakers. I had the same problem until I did this.
WOOOOT for r6, clancy should autograph my copies of rainbow6, RS, RS:UO, RS:CO, RvS, Lockdown, GR, GR:DS, GR:IT and now GRAW. Anyone remeber way back when on ebay that sold that signed copy of GR?