This means that if you have speakers as "Sound unit" and headset as "Standard communication" you'll hear the sound from the game through the speakers instead of the headset. This means you'll have to change your default sound back and forth before you start / stop playing DayZ. Kind of a pain.

There needs to be an option in-game to select which device you wish to hear the game through (Just like any other application that are in existence pretty much). This was an issue in arma as well - but now there's a place to report it! Yay!