The problem with Monster Hunter 3 is that you seem to be running the game faster than 100%. You must now play at exactly 100% to have correct audio in games like this. If it's less than 100%, it will stutter. If it's greater than 100%, it will sound too fast.
Try setting Framelimit to Auto and disable Limit by FPS.
Try setting Framelimit to Auto and disable Limit by FPS.
