I've tweaked every setting I could find, even the hardware acceleration. The sound buzz is not consistent either, worse on some models than others. If it was across the board with all models all the time, and problems with others simulations on my system, than I know it would be my computer's problem exclusively. This annoying sound issue is unique to AFPD, never had it with my Realflight G2. I've reinstalled it a couple of times as well and no help...