Since pisound-btn version 1.11, there’s a new menu in sudo pisound-config for making it easy to manage the software workaround for reboots on Pi 4 and checking whether your Pisound version has a hardware workaround for the power supply design change in Raspberry Pi 4 (since Pisound hardware version v1.1):
Once Pisound is back in stock, they’ll be the v1.1 ones.
You can get the latest version of pisound-btn by running:
sudo apt update && sudo apt install pisound-btn