I´m from Brasil and at first I was very well impressed about BIAB possibilities. After some time as a user I finally quit using BIAB due to its 2/4 incompatibility. Playing bossa nova nylon guitars in 2/4 time melodies sounds like... bossa nova. To me its very weird the lack of efforts in developing samba RT. I came back to this forum after three or four years hoping to see some good news...it´s a pity.
I understood from (Noel?) that Realband is better at handling different beat counts per measure.
there are some nice samba (?) midi files here,
samba , and maybe some one can convert something properly?
PS i've been looking briefly again at what (MIDI only) Soundtrek Jammer 6 has to offer. In regards of beatcount settings quite more, but it has some drawbacks. F.i. you're stuck with Microsoft's wavetable synth, and you can't address a VST GM synth simply for sounds, unless you use a router like MidiLoopback etc. So maybe interesting if you use a hardware GM sound module .... Jammmer is not very expensive, though IMO it's a little complicated to understand the interface, and has far less to offer in the styles department. They seem to be working on a general overhaul; i am still curious, as its really fast and responsive. F