Gamers still hoping against hope for a true follow-up to Half-Life 2 (after so, so many years) may remember last year's flurry of speculation that Half-Life 3 was finally nearing completion. Amid all those rumors, though, we never got any official sign from anyone inside Valve that a Half-Life project was currently in development.

That changed this week thanks to an apparent slip-up during a panel at GameSoundCon, an industry conference devoted to "the art, technology, and business of game audio." In a panel devoted to Valve's use of open audio engines (captured in this Vimeo clip), Valve composer and audio artist Mike Morasky let an interesting string of three letters slip while talking about the way the company implements high dynamic range (HDR) audio: