There are other DAWs (recording programs)that may see such an interface as straight USB into the computer if MC does not. There is Reaper, and Audacity, others I can not think of right now, but in the end if you want anything else used to record, like a synth or microphone, or MIDI, then usually an audio/interface has all those connections to aid that.
Well, there are other threads I think in this forum that you can look at and seek an answer on that USB type connection also.
Yes, you get drivers with the audio/interface and make sure they will update it for future OSes also or duration of how long the audio/interface will work before it becomes well obsolete.
All that stuff has to be considered before perhaps buying anything, or "Let the Consumer Beware".
You can read up on all of that on the Internet. Whether MC works with anything I do not know, it may decide that an audio/interface would just be better to record music on, and by the way, although a notebook can be used, it is not probably the best computer to use either depending on if you use a lot of soft synths (drum parts) or other parts to add to the recording.
Yes, it can be expensive, but it can be done somewhat cheaply to start off with also, but like anything that is a hobby or maybe even professional, usually some money will have to be spent on it to begin with.
check other threads here in the different forum part.
You can also listen to a sound card (Creative) that was sort of made for games but could also record music also, because Creative Labs (Soundblaster type sound card) had ASIO drivers that allowed the signal recorded to play at the same time as another recording input being done or track with multiple track recordings, and all done, but the quality is such that I would not want to do that way forever and did not and bought a real audio/interface in the end.
http://www.youtube.com/watch?v=ELBdIiPmfSk I did not say I was great or anything, just done with the song for the time being. Of course I have learned other things also now along the way, mostly from this cakewalk forum.
Before it was done just to fool around, I may still just be doing that but a little better nowadays.
First you would have to have equipment that allows it to be done. And just a USB connection input may not do it.
And like Scook stated, you may only have half the interface and will have to see if it works with what you have.