I used this Github project. https://github.com/omriharel/deej This should tell you everything you need to know about the programing and wiring. I just made a case and some key caps for my dials. 

This case fits a Arduino Mega 2560 and 5 standard 10k Potentiometers.

Parts Used:

• Arduino Mega 2250 (38x55mm) https://www.amazon.com/dp/B0BXDNF6Z6?ref=ppx_yo2ov_dt_b_fed_asin_title

• 5 10k Potentiometers

• 6 M3 Screws

• 6 M3 Brass Inserts (Press heated into the part via soldering iron)

If you do use the same Arduino note that its a clone and Windows installs the wrong driver for this chip "CH340G". You will have to source the correct driver. 

There are stand offs on the case bottom for the board to mount. The hole in the back is meant for the usb cable to go into and wrap around the posts before plugging into the Arduino to prevent cable / port fatigue.