I am try to do some recording in GarageBand. I have a Behringer UCA222 interface deeley to record. My guitar connected to this properly, and the UCA is connected to the mac correctly. But when I go to record nothing is happening. Its just not picking any thing up.

I have the interface selected as the sound input device in system preferences, as well as in the preferences on GarageBand. In fact, to my eyes it all looks how it should look, apart from one thing. The recording slider on GarageBand is stuck it 0 and I am unable to drag it up. Obviously thats why its not working. But I do not know how to fix this. I am probably just missing one thing, but atm I'm lost.

Is any body here able to help or give any suggestions?

It would be greatly appreciated.