Just realized my keyboard is pinging. I used old mx brown on alu plate. Not sure its from case, internals, or switches. Though i haven't tried filling inside case with dampening materials.
I opened the board, leaving only the internals, knock it from "cls" logo and i hear pinging noise traveling from knock point to opposite area (caps lock).
I will try filling the case with dampening material first and report later.
If the ping persists, i think i'll make PC plate.