I discovered my mistake!
All works perfectly now.
There was a midi channel conflict. For instance, my volca beats was on channel 10, which I knew and had properly configured on the Note Setup page for midi track 1, and thats why turning the CC encoders worked as expected.
BUT on Project -> MIDI -> CHANNELS -> Track 1… channel was set to 1. I set it to 10 (or off, as i wont be sending notes probably)… and it worked.
That was the missing piece of the puzzle.
I wrote a small tutorial in Spanish, for those that hablan español 
https://sintetizar.mailfighter.net/showthread.php?tid=37