For info…
There have been a couple of threads about Samplerbox in the past, but as a beginner with this stuff I couldn’t previously get it working.
However…I just disovered this expanded version:
https://homspace.nl/samplerbox/
I simply downloaded the latest image and flashed it to a card, edited configuration.txt via a PC to change:
“USE_48kHz=False”
…to
“USE_48kHz=True”
…and it “just works”. Plugged a MIDI cable and a line-out jack into my Pisound, and I was able to play straight away.