adding buttons for playback controls.

[Lule256]

I have been racking my head trying to add gpio pins for playback controls but am hitting build errors

[WillyBilly06]

Hey @Lule256, sorry I have been busy with stuffs irl and don't have too much time go through the code again but this project is built to be used for the quad encoder from adafruit but I think you could copy the functions of the "2.1 audio" mode and turn it to AVRC command controlling.