The Steam VR Performance Test has gotten a ton of attention lately, but one of its cooler caches of buried treasure isn't the usual oblique reference to a sequel that's never coming. It's a soundfile of a recording session for Portal 2's announcer, found in the earliest (and no longer available) version of the demo. Thanks to a lot of cleanup work by Valve News Network, one can hear the directors giving him instructions.
The announcer is the actor Joe Michaels. This is a very long soundfile, some 20 minutes, so it's probably best to just skip around to hear something interesting. The directors are Valve writers — including Erik Wolpaw — working on Portal 2.
This video and audio doesn't betray any great secrets about Portal or Valve, but it is a curious window into how one of the most critical components of a video game gets done, and supplies a key storytelling device. Because we've all heard bad voice acting before, and know how jarring it is to any sense of participation, much less immersion.