I'm very new to iRacing (after taking a 7 year break), so I may be imagining things but...

I installed CC today after about a week of playing iRacing. I jumped into a new series, the Sim Lab one, racing the Jetta. I immediately noticed that the outside sound fx when at speed seemed quite distorted and hissy. I wasn't sure if this was caused by CC, or it's just the way it sounds in the Jetta, so I then jumped back into the Rookie MX-5 series I've been doing all week - and it seems like there is still a slight hiss when I get up to speed.

Could this be caused by CC? It's happening even with CC disabled - does this app change any iRacing sound settings? Note that I'm running 5.1 audio over NVIDIA GPU out to an AV receiver. Help!