There is a very robust MobiFlight software that is free and uploads custom firmware to Arduino Mega 2650 Rev3 boards and you can do up to 40 encoders, 60+ buttons etc. on a single board, to control anything. I’m building a VR Control Box with it: [WIP] cheap DIY VR Control Box - 6 dual encoder / 8 button / 1 3-pos switch project
