Hi Matt! thanks I reply to your answer line by line so it's easier:

Awesome artworks mate !

Thanks!!! I'm sure is gonna be even better with your soundcard :)

Yes some GPIOs are being used.

The device tree is a good place to start to look : https://github.com/raspberrypi/linux/blob/rpi-4.19.y/arch/arm/boot/dts/overlays/audioinjector-addons-overlay.dts

For codec controls :
pins : 13, 15, 16, 18, 29
GPIOs : 27, 22, 23, 24, 5

The sound card also uses the I2S gpios : 18, 19, 20, 21

Are these GPIOs or Pins? 

I2C is shared with other applications GPIO : 2, 3

That means other applications can use those pins too as I2C? I'm not an expert as you can tell...
 
Thanks a lot!
A


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ALBERTO NOVELLO / JesterN
video snippets: instagram
av compositions: vimeo
site: jestern.com
shop: bandcamp
audio: soundcloud

 
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