I thought it was 128, is 56 even an option? At any rate, it shouldn't effect playback. I haven't noticed any extra suck, but yeah, check for driver and volume issues. You never know when one of the channels is messed up some how, whether it's set too low, turned off, has an effect placed on it; especially with sblives because with the normal drivers the options aren't as obvious as with the liveware set.