Yes there is indeed a mute operation built into Hugo. Some OS/software (no names) do not handle the changes from sample rate gracefully, so the computers buffer has data which is flushed out by the media player at the wrong rate. If it is DSD data being treated as PCM, you get a horrible noise. So I had to fix this by muting the beginning of whenever data changes or SR changes. The function of mute delay, plus volume ramp up, plus exponential smoothing of the volume coefficients means you lose about half a second. But you would not want to hear that garbage noise! Also, when I have had to reset Hugo, it is the computer driver that has failed, not Hugo. By turning Hugo on and off, the computer re-establishes USB connection and (mostly) re-sets itself.