Audio controller/volume mixer

My first model made by me. This is version 1 which probably needs reworks and modifications. I am working on system which will secure arduino without need for somekind of glue or cable ties.This project will allow you to controll individual volume of programs. For example:Knob- Master volumeKnob- DiscordKnob- Chrome Knob- CS:GO, GTA V, R6 and so on…Audio controller is using DEEJ software, Github ( https://github.com/omriharel/deej/ )What is needed?:x4 M4 insertsx4 M4 screws (max +-20mm long)Ardu