AudioVMs in 4.1

In Qubes 4.1 alpha pre-release, how do I redirect the audio output to another VM (as opposed to dom0)? I’ve noticed that https://www.qubes-os.org/doc/audio-virtualization/ already discusses Qubes 4.1, but I’m confused about how to use qrexec services. Can someone spell out the exact commands I have to execute to get this running? Or is it not ready yet? From reading some other messages, I believe that at some point there is going to be a GUI for making this work.