Apologies for the slow updates everyone, I've been having a bit of a difficult time getting stick into projects at the moment.
Today I have tested the setup for menu, using a Wemos Mega + WIFI board, i2c LCD, some push buttons and the dfrobot mp3player unit.
The menu is simple, butndoes all itllnever need to do. Clicking the rotary encoder button selects either Bank or Volume on the menu and rotating it will adjust the relevant variable.
Next I'd like to solder up a small board with the jack sockets in it, alongside the screen and encoder. This'll keep the in case set up nice and neat.