Forget about Respeaker, it’s no more supported since months by Seeed and incompatible since nearly a year with current linux distros for Raspberry Check here in forum and you’ll see quite a few person complaining about it and Seeed staying very silent on it
Hi. Have to agree that the Respeaker isn’t the way to go because of the lack of support. Unfortunately just bought one.
However, it does work with the Pi 4 ok. To use the supplied drivers you will have to downgrade your kernel, but someone has forked a copy of the drivers and fixed them to work with the latest kernel (check out the github issues). I’m now running Rhasspy with those drivers and latest Rhaspbian.