The author remixed this model.
I just added some holes for the KY-040 knobs. This so i can controll the volume of the PC also.
I have acutally added two, and thy are connected to two different Ardurino micro Pro boards.
One is connected to my “gaming” PC to controll the volume and the other is connected to my main PC where HASS Agent is also running to allow me to controll the buttons