Sounds playing 2x faster than they should (I'm stumped)

[Aelirie]

After messing with the settings further, I've found that checking "Synchronize GPU Thread" Fixes the problem with the sound, but also kills performance and sets my fps back to 14-15.
I am currently testing on Super Mario Sunshine, but first discovered the problem while messing around with Twilight Princess.
I have messed with virtually every setting, but I'll post pictures of my current.