Joseph posted Nov 20, 00:09:
(Update November 2021)
You can now find a ready-to-use image for Raspberry Pi 4 on the "Make It (software)" page of https://www.samplerbox.org.
PS: In the case you have no sound, you can modify the
AUDIO_DEVICE_ID as explained in https://www.samplerbox.org/faq#nosound.