I THINK I GOT IT!

Captain Sim, do you ever hear FSX sound pops/clicks when sounds loop?
707Captain, do you ever ever hear it?

I do. I have problems with PCI Latency, and I think it may be connected to this. It's absolutely connected to the sound pops.

**PCI latency is the amount of time the computer "holds" the video/sound card before it can be used by another program.