ATC Static

Can anyone help me please. I've just loaded FSX for the first time - no problems. Graphics look good and I'm pretty happy with what I see. I've been a simmer for a few years now and was a bit reluctant to leave FS9. Happily still got it firmly on my drive. I seem to have a problem in FSX with ATC and static and only on receive. I can't hear the controller just static. Pilot's transmissions are OK - clear as a bell. The other strange thing is I get this static sometimes when lowering flaps. This may be something which has been raised before in the forum and I apologies it it has. I did find a brief reference to it during a search but could find no solution. I hope someone can help. Tx Crocker