Sudden Audio Crackling?

[SnesFan413]

I've been using Snes9X for a while now, and all of a sudden I've started experiencing bizarre audio crackling while I'm playing games. It varies in intensity depending on what track is being played, but it's almost always there to some extent. What's really odd is that it just started happening out of the blue. I was in the middle of a game when it started happening, and barring me accidentally pressing a hotkey or something like that, I didn't change any of the audio settings. I've tried two separate speakers, both of which experienced the crackle when playing audio from snes9x, and neither of which output any crackle when playing any other audio. Does anyone know why this is happening?