Hello Ivan. I don't know if I have the answer, because I write jazz sambas not 'traditional' samba, but here are a couple of reactions.

Your song tempo seems quite slow, requiring you to double-time some parts as you say. What is the temp set to?

I use cut time to notate my sambas, rather than 4/4, because it seems to fit BIAB better. For a cut-time samba, write it in fast 4/4 and force the RealTracks patterns in 8 rather than 16. Thus I use tempos like 220 when I really want 110.

As I'm sure you know, cut time looks like 4/4 but is counted - felt - in 2/2. You count off the chart as 1,2; 1,2 rather than 1,2; 1, 2, 3, 4.

BIAB has some nice traditional samba RealTrack instruments for acoustic bass and acoustic piano at a 'home' tempo of 190. The RealDrums for samba are widely adaptable to a range of tempos. Guitar, though, is a problem. The really good nylon guitar is a Bossa guitar at 140. While it is remarkably expandable to other tempos, it doesn't have the feel we need for samba at high tempos in BIAB. I have put a request into the Styles Wishlist forum to see if PG Music could make a nylon guitar at 190 to match the other samba instruments at 190.

Does that help?

ps I noticed you asked about the manual being available in Portuguese. Did that get answered?

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.