This is an old topic but I'm experiencing this too. But it isn't just playing sounds, it seems to be sound-related functions. For example, I have an menu and when you press the button it plays the sound. However, it also stops the previous sound so that they don't stack. However, if I press the button pretty fast and then stop, I'll hear about three effects still play. They play properly in that they aren't overlapping, but improperly in that they shouldn't be playing at all. There is no silence before my sound effect, I deleted it to the millisecond in Audacity, but no change. It's not just one sound effect either, I've long noticed they were off.
Any pointers? Anyone else with this issue? Surely it's not just two people who have noticed a delay in the audio system?