If you want to record from multiple microphones at one time, you need a multichannel audio interface. If you want to record one microphone, you need a single channel audio interface. You have two channel audio interface, so theoretically you could…? I´m sure you get it…
If you want to listen to what you reorded via speakers, you obviously need speakers. If the speakers are passive, you obviously need an amp to drive them…
If you want tro listen only via headphones, you need headphones…[/quote]
Well that all makes sense to me 
Now, atleast I know that I havent plugged it in wrong… But what I dont get then, is what I have done wrong… Any idea about that?? I just cant find anything that makes sense to me in the manual 