EFM releases Fuff Muzz v0.4 newseffect plugins May 26, 2008 0 EFM has released version 0.4 of Fuff Muzz, a freeware distortion effect plug-in for Windows PC. Changes in v0.4 Cleaned the tone control. Added knobs from ouroboros. Tom has uploaded a demo mp3 here. You can download the latest version of Fuff Muzz here.