I've noticed that towards the end of every song there is an audible "tick" just before it ends. It's almost like the sound a needle makes going over a record with a scratch. Trying to isolate the cause of this has led me to believe that it is when DSP is enabled the glitch (for lack of a better word) happens, because when I disengage DSP the songs play out without the sound. The various DSP settings I use are Equalizer, Parametric Equalizer, and 3 third party DSP modules, Easy-Q, Head-Fit, and Marvel GEQ. And before you ask I disabled each module one by one, until I was left with no DSP modules used, and only then does the audio glitch disappear. I still have MC17 installed, and this audio glitch does not occur with it. In audio settings I use the SPDIF interface with WASAPI (default settings) and my Fiio E10 dac/amp (same as I did with MC17). Using Windows 8.1 pro, with the most recent version of MC21 (.27) as of this post.