I installed it successfully and the noise (like the noise that old vinyls do in turntables in a digitial version

As it seems my installation suffers from the shared ethernet/usb port and i can't do anything about it as it's not a software bug.
I thing it's time to move on to my next embedded hardware (cubox i-4 pro maybe?) as i've lost countless hours trying to figure out what's happening.
FYI in pure arch installation i had no problem with audio lavels changing. It always stayed to 100%.