I´m studying BIAB for a few months, and 2/4 time - very common in Brazilian music - is a mistery to me.
I´m trying to write "samba" and it sounds like bossa-nova
I´ve tried this experiment, creating a style from midi:

- drums from a midi file, trying to play like a "pandeiro"
- guitar at first from a midi file, then replacing it with RT Guitar nylon bossa (1103)

As writing the song:

- wrote at least two chords per bar (inserting two 2/4 bars in a 4/4 bar)
- set RT instruments to double time (otherwise they wouldn´t match drums time)
- soloist: RT 1374

The resulta was: http://www.box.net/shared/eghr7ttys1075u52avcv

I would appreciate your comments/hints on this.

Thanks a lot.