Ugotsta: when I was a teenager I used to do my first tunes on ScreamTracker3. ^^
I've always looked for open source/alternative musical production softwares.
In terms of simplicity I felt like psycle looked better in its interface.
FL studio, I tried it a long time ago (when it was still fruity loops), after scream tracker3. It's indeed quite close with trackers.
Reason is my graal. Someday I'll buy a commercial version and have a lot of fun with it <img src="smileys/smiley4.gif" border="0" align="middle" />
In the meantime, when I'll need to do music, I'll settle for lmss or sunvox/psycle.