I know this is a dumb question, but is it a built in feature (so you can turn it down rapidly when you forgot what volume you had it set to last, etc.) or just a side effect of some of the digital circuitry that with most digital volume knobs if you turn it a 1/4 or 1/2 turn slowly it may change a few dB but if you turn it very rapidly it may change 40-60dB.