Good OS with a little bit of manual tweaking can't be improved by any additional software - with the exception of MC maybe. MMCSS has to do with Windows Audio Services in a sense that when AO disable Audio Services, it will automatically disable MMCSS, too. I also dicovered that the paralle use of AO and Fidelizer does more bad than good. Almost every tweak can be done manually with more control of what you're tweaking with the same improvement of sq or sometimes better sq.ĭon't get me wrong: AO and Fidelizer are good pieces of software for those who haven't the knowledge to go deep inside the OS by hand. My experience over the last months is that theres no need for AO or Fidelizer. That's why the gaming community is tweaking mmcss as hard as they could. MMCSS has nothing to do with the Audio Services of Windows. It will have an effect as long as any software like roon, hqplayer or simply the asio-driver (my RME does) using mmcss.