SOLVED...Odd FS9 sound issue...

I'm lost. For some reason whenever I exceed a certain speed in FS9, (different with each aircraft) The wind sound changes from it's usual "windy" noise to more of a clicking or buzzing. This has only developed since a reinstall with XP 64bit. I really don't think it's hardware, because I've already tested with a different sound card. (The card I swapped for the original was from a different manufacturer, so that should eliminate the possibility of this being a driver issue, too.)
I'm not too worried about it 'cause I'll be formatting and reinstalling soon, but it still bugs me.
Anyone else been through this?
I'm not too worried about it 'cause I'll be formatting and reinstalling soon, but it still bugs me.
Anyone else been through this?