I had no clue! I was always using the one under Playback > Output. The one you mention is at 10 by default, that seems quite low. Increasing it seems to give a large hit to my spectrum visualizer frame rate. Im thinking of re-enabling the device I disabled before and increasing the buffer to see if that would help but honestly I think I'll leave it the way it is. Why fix what ain't broke? But thanks for the tip.