ok, so I had one day to try this thing now. I´ve swapped it with an m-audio profire 2626. I definitely got to say - software mixer is well arranged and works for me(better than m-audio). runs stable on my mac, crashes on my win7 64bit(time to get a separate firewire card I guess).
what I wanted to say is - the preamps are stronger and sound better than on that m-audio. definitely very audible. also they have a somehow warm feeling to them which I like.
what still pisses me off is the craftsmanship. obviously you can´t expect proper knobs at this prices - so basicly I am thinking about sending this one back too and getting something more expensive. like a presonus firestudio tube or rme.
has anyone ever used the adat interface on that pro 40? I heard those adat covers are very unstable and basicly fall off or go inside the device when you try using them - anybody tried? (I am kind of afraid to do it.)