Where's the prob?
Since I'm spending 8 hrs/day with Logic Audio Platinum (and did so since 1986, C-Lab Creator 2.0 is the beginning of my upgrade path), I'd like to explain something:
Logic Platinum, or "Pro", is for professional musicians, and those who operate a recording studio. I use it on stage also.
Logic Express is for those pros who don't need the full weight of a big studio. Might (?!) be interesting for the abitious amateur as well. Still, there are incredible features and the not-so-easy-to-grab concept of MIDI and audio hybrid recording, and of setting up your equipment. (What makes Logic so complicated is the approach to create a virtual representation of your studio equipment within the machine. And studio designs vary widely.) There is a learning curve.
Garage Band is for Joe Average. It's easy to handle, but limited (in a way that will not hinder Joe A.). "Hey I can connect this mike and sing to my Mac!" He'll never have heard of a microphone preamp anyway. (The finest microphone I own is $2800.)
Soundtrack, as stated before on this thread, is a video app.
Now, where's the problem? The problem is, as often, Apple marketing. Please don't let the pros explain that they'll create their next big hit with Garage Band. That's crap.
I don't think the pros really know what J. A. needs.
EDIT:
The emagic online store is down right now. We'll have to check out what upgrades they'll offer. In the past, upgrades have been reasonably priced.