Short update: after almost three weeks I can say that it easier than I expected.
Like I said I started using the OT as a Digitakt++ loading samples and composing some throwaway tracks just to experiment with the various functions.
I also read the Merlin’s Guide and the Manual (all the Manual…I printed it for simplicity).
Now I’m starting with sampling and looping following the manual instructions and the EZBot’s videos…and it works!
Then…super happy with my OT.
…now I only have to learn to write good music