Ok, after spending some time on investigating the issue, I found a workaround that makes the Synth operational again without having to uninstall KB5079473 cumulative update: after turning Synth on, go to device manager and open it at “Sound, video and game controllers” branch. There, in driver section, click “Restore previous driver”. Once done, shut Synth down and start it up again - you should now find it usable again.