Hi there, Franco. I understand your frustration. I totally relate bc I’ve been there.
My suggestion is:
Read the initial section of Chapter 9 of the User Guide (v.3.2) MIDI In (p.57). Take a look at MIDI ECHO.
After making sure your synths are correctly connected try setting up MIDI ECHO. If you choose ALLOW ECHO make sure you do not create a MIDI loop (this can be avoided by switching LOCAL ON to OFF on your gear).
You will also have to configure MIDI OUT / MIDI THRU (cf. MIDI out, p. 58).
It really doesn’t matter if you connect a single MIDI controller or a MIDI MERGE hub with a bunch of controllers attached to it to PYRAMID’s MIDI IN. Just make sure that your cables are correctly connected from outputs to inputs and viceversa and make sure that your tracks’ MIDI channels match your synths’ assigned channels. It helps if you draw a MIDI-flow diagram.
A MIDI MERGE hub is an excellent solution if you don’t have a hardware MIDI patchbay (especially one with MIDI merge function). I rarely use a DAW, so I have more than one MIDI patchbay and I also use Kenton merge and thru boxes. Everything works ok.
Bear in mind that the User Guide was not writtem by a native speaker of English and sometimes it’s a bit difficult to understand what the guide means without a trial-and-error approach. I am not a native speaker of EN by the way, so … beware.
Summing up, i) connect all the INs and OUTs correctly (labelling your cables is a good idea), ii) match track channels and instrument channels and iii) fiddle with MIDI ECHO + MIDI OUT/THRU settings on the PYRAMID and you’ll get there. When you get there either save your settings or make a note in your log.
Good luck. Enjoy the PYRAMID. It is a glorious machine.
(someone above mentioned Mr Tuna’s videos on YouTube; he doesn’t explain much but what he does with PYRAMID is really amazing; not my cup of tea music-wise but the way his whole set up is controlled by the PYRAMID with the help of several hidden merge and thru boxes is awesome; I remember watching a video a while ago where he talks about the structure of his setup and briefly shows the merge boxes and split boxes)