The Mbox 2
Pro doesn't have a Mix-knob, Mbox 2 has.
I've already tried trashing the prefs, also installed the software on two different computers. Same result. If I use the Mbox as audio output from Windows, this signal gets distorted as well (Windows Media Player etc.).
Therefore I disconnected the Mbox, trying to get a nice and clean signal through it when used standalone as an analog mic/signal preamp, without possibility for having Firewire and/or Windows-issues.
So far, I'm stuck.