After getting my Ultrasone Pro900 this week and playing with parametric equalizers in foobar
I did a search on system-wide equalizers (as the Electri-Q standalone doesnt seem to work with my DAC)
and found this free one over at sourceforge ->
http://sourceforge.net/p/equalizerapo/wiki/Documentation/Only thing it lacks is a GUI for on-the-fly adjustments...
As editing the config.txt instantly changes the output I wonder why no one did a GUI yet :/
Anyway, this is a nice piece of software and I figured it could be interesting for other people here as well, so give it a try!