If the Respeaker seeed-voicecard entry does not appear under the list of audio sinks of your Raspberry Pi
after installing the Respeaker seeed drivers provided on their Github, try adding this line to your /boot/config.txt:
dtoverlay=seeed-2mic-voicecard
This can change according to the linux distro you are using. For example, if you are using DietPi you need to place the
line above in /DietPi/config.txt.
The drivers are in fact correctly installed, the only problem is that the device is not listed.