[I WAS the One]

using a MIDI controller with Soundtrack?
here's what happens: I went to an Apple Store to buy a MIDI controller and Garage Band, but suddenly an employee recomend me to buy soundtrack because it was a better application than garage band. and guess what? I do not understand Soundtrack at all, in fact, I try to use my midi controller with Soundtrack and nothing happens, I know now that I can return this software because its opened, and ALL I WANT is to use my MIDI controller with Soundtrack... it is imposible? you tell me, because If I can't use this equipment I will be forced to sell it on ebay on MINT condition. the point is I want to create music and all I can do with Soundtrack is mix loops!!

HELP