Lisa said (on Twitter) the same thing as @mrchrisadams: distortion.
When Anique and I tested the same configuration, there was no problem. I think it is not audio distortion, but digital “chopping” due to not enough bandwidth in upload.
Given the heat, we were in the living room – fresher than the office, but using a range extender for the wifi. When we tested, we were going through my computer, which was connected to the router via an actual Ethernet cable. This has quite a dramatic effect on the bandwidth.
Updating the wiki now.