since my setup is working (with dac+ setting in rune) i will continue planning my autonomous hifibox.
I want to use a physical rotary knob to adjust the volume. As far as a know i can use any rotary encoder, three GPIO Pins and a little code to adjust alsamixers volume value.
Now my questions are
1. Where do i have to put that code to?
2. Which GPIO pins can be used?
3. And most important: What's the code?
I hope, i explained everything clearly and that anybody will some advice for me.