It's really a question for Massimo, but here's my take:

First - get the Latin Style pack. Just because. I will guarantee you will find uses for it.

Second - in my experience, once you PLAY a song, or compile it (tell it to play and let it compute the track) whatever use set it to count bars, style, tempo - but NOT mix) are saved with the song. If you do NOT select play after selecting a rhythm but merely press a control, I do not know what it does. But once you Play it, you Save it...