From what I've read ......
Alberton should be a lot like ACID.
It should have its own explorer window and you should be able to drag and drop files into a "track" and then "paint the loops to length.
It should have a set of transport buttons to start/stop/pause the playback and the options menu will route the output.
I believe its intended to be a looping program as opposed to a true multitracking program ..... as is ACID.
I dont actually own it (I do have ACID) but have read a few reviews and articles about it.
You should only need a keyboard if you want to play vSTinstruments live into the program (or live THRU the program).
-mike