I'm sorry Toleda, but it didn't work for me.
Luckily, I solved the problem using this version of VoodooHDA.kext : https://sourceforge.net/projects/voodoohda/
This time I can see Internal Speaker and so on in the list where, previously, I only could see 4 Digital-out (HDMI).
I started over a new fresh install of High Sierra (10.13.3) where everything but sound seem to be good.
In Clover boot I used: dart=0 nv_disable=0 and I didn't check any boxes in the graphic options.
This time no problem at all with Internet :) but in the sound panel, second tab I have an...
Okay, I solved it.
I managed to copy kexts from Other folder of my previous install to paste them into the new one.
But I didn't have to use them because I took care in Multibeast and checked the last check boxes of Atheros/Intel/Realtek (one each).
When I booted the OS, everything was fine...
this is my first hack. I'm almost done, thanks to you.
Impossible for me to get Internet after Multibeast.
As Internet connection worked fine after Unibeast, maybe I could get some information from it in order to put it after Multibeast.
Okay, but what exactly? And Where?
Hope it won't...