Software set up
Download this image and write it on a microSD card (with an imager tool, see here).
Boot it, connect a USB MIDI keyboard, and it will work!
Download size: 848 MB
Required hardware: Raspberry Pi 2 / 3 / 4
Login / password: root / root
Still no sound with your device? This might help!
Follow the instructions here: http://github.com/josephernest/SamplerBox