From what I learned so far "the tumbao" pattern is
^vXX^vOO or
^vXv^vOO
or in english
heel fingers slap slap heel fingers open open
heel fingers slap fingers heel fingers open open
Now, I have a video "Findamento II" by Boby Sanabria
It's all tumbao. He shows Guajira, Son Montuno and Mambo
and it's all second line tumbao that I notated above with a little variation where it's only one open tone. Other then that the only difference is tempo.
That's one of the reasons why I started this thread. What Pottato played didn't sound or looked like tumbao I know. Then of cource I don't know that much

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