At long last, the Tablo OTA DVR can now optionally provide the frequently requested surround sound. The firmware update, rolling out in waves now, enables owners to toggle AC3 audio encoding… with a potentially significant caveat: not all Tablo clients are currently 5.1-capable. So while your Roku can pump out surround sound, if you also view your recordings on Xbox Once, you’ll be treated to a whole lot of silence. Tablo’s blog post breaks down their technical challenges, design decisions, and itemizes supported devices and scenarios.