A schematic of the setup and an idea of what it is supposed to do would be a first step. Do the relays have drivers? Which I2C expanders? IR or Bluetooth? Bluetooth is easier with a Android smart phone and the touch screen could be omitted. Use the phone display. There are several Bluetooth terminals and application builders available, many free. I use Bluetooth Electronics on my Android tablet. It is free and avaiable on the App Store.
The relays will have drivers on the main PCB. They switch an audio routing matrix.