I made work the right brain, as Nicholas would say, and I tidy up a bit the patch, the best thing is to use the send-receive objects, with those you can avoid many lines.
I found out also that a good way to clean the patch is to rewrite it on a paper, which gives you the possibility to reflect longer on every step and connection. I’m probably I bit antiquated in that, since I have to turn to the old pencil and paper, but still it works for me.
After weeks struggling on it here is the final MAX patch. Eventually, it works!