Well, I'm not sure it's legal to give you the original sound files, so I can't do that. Unless you want to reinstall, or don't have the patience, wait until the next update for DCS. Most of the time, it reverts itself back to no modifications (clean, so to speak) after the update, and a little "backup.xxx" folder (xxx being the backup number, 001 for example.) will appear in the main game directory, holding all of your mods in place for movement into the game directory whenever you feel you want your mods back.
Hope it helps,
Yours Truly
P.S. : Welcome to the forums. :pilotfly: