Howdy lads, As some of yee know, I have recently bought the Beyerdynamic DT 990 250ohm headphones with the Fiio E07K DAC\AMP and I recently bought the E09K AMP as I just wanted to get it for the craic ^^ My main issue right now is getting some proper control over sound quality. I want to use Viper4Windows or Equalizer APO but for some reason they just don't work for me? I can't find any information regarding my problem so I'm quite stuck :/ However! Razers Surround Pro is the only program that actually works but at the cost of overall quality as it reduces sampling rates. But I am able to mess with the EQ but it doesn't do a very good job and I want a better program to work. Has anyone got any ideas as to why these programs won't work? and how to get them to work? Cheers lads.