Thank you, very much, for your comment, AKAChristopher.
Forgive me for replying with so much delay.
Yes. It's a total improv. No revision, no previous ideas, nothing.
I just start, pick up the phrase or rhythm that tells me something and go on from there.
For me it must be in one take.
If it's good, fine, if not, I drop it altogether.
Thaks again for your kind words.
Um abraço