WAIT
Never mind, it seem to be only happening with this project file AND it does it even with onboard audio.
What i don't understand is WHY. It's not near 100% CPU load or 0 Db.
EDIT: Never mind, had a chat with Zircon. The problem was with Kore Player. Which is pretty weird, actually. It wasn't maxing out my RAM, CPU, or the volume, so I can't figure out why it would clip the audio. But Zircon was right, it was definitely the Kore plug in, because I swapped it out with a soundfont and the audio was crystal clear.