I got this set up today...(Googled pics).


I'm no pedalboard expert, but...it's definitely fun. It doesn't take any Linux skills (fortunately). You can just download an image and use it to prepare a micro-SD card, plug it in, and you're away. The Raspberry Pi reports an IP address you can type into a web browser on some other device, and suddenly you've got a nice drag-and-drop GUI in which you can play around with a wide selection of audio effects, sequencers, sound generators, drum boxes...wire them up by dragging some cables around, and start playing. (You can run a guitar straight into it, or a stereo line-level signal, or MIDI.)
I believe you can then just take the pedal and use it standalone, selecting from up to eight rigs by tapping the button. It got me playing, anyway, and that's the main thing for me.