I'm running a Schiit Modi 2 DAC and getting no sound in the game, tried restarting a couple of times, disabling all other audio devices, etc. Changing my sound level (or testing the device) through the Windows 10 Playback Devices confirms that the sound works otherwise. No problems in other applications or games.

Probably irrelevant to the problem at hand but I have an RX 270 and the graphics performance is also very choppy at high settings (2560x1600).

Hi aeaus, we're sorry to hear about this problem. One of our developers also has an external DAC and that works fine, so we can be fairly confident it's not related to it being external. I'm sure it is, but it's worth checking - are you sure that your DAC is set to be the default sound device?

Yes, it's the default playback (and only enabled device). Strangely any output that was playing before (e.g. Spotify) will immediately stop 5-10 seconds after I launch the game (when it's still at the elipsies loading screen). I need to unplug and replug the DAC before any sound returns (game audio continues to be absent).

Do any other DirectX games work?

Unreal Engine 4 definitely needs more work with regards to audio (you can't change audio devices during a game right now for example), but we haven't seen that issue before! We have a SoundBlaster X7 in the office which works fine, but that's the closest thing we have for being able to try and reproduce your issue.

Yes, I've played Stellaris, CIV V, VI, XCOM 2, FC4, etc on this machine without problem.

I managed to find a workaround, but it's a bit weird so this might get confusing. My motherboard has a built in 3.5mm output, I'll refer to this as "Headphones" as that's what Windows recognizes it in the Playback Devices manager.

If I enable that device and plug something in, and then in the right-click menu for that device "Test" it, I can start the game and get audio through the DAC. If I don't run the "Test" immediately before starting the game I won't get audio. Restarting the game results in no audio, but running the sound test again and re-starting the game works.

Setting the Headphones device as the default and using it for audio also works as expected.

I'll do a bit more testing later, but right now I have game audio and want to play through a mission while it's working right.