Sorry, I totally missed that. I've installed the sound module but now every time I select my card from the Settings tab it restarts and the option goes blank again.
17:8:11.701 NaudioPlaybackEngine: could not initialize playback device.Exception from HRESULT: 0x88890008
I just discovered that it will let me select my sound card if I choose 2 (Stereo) under Max. Channels. However, I only have one ButtKicker so need to use 1(mono).
With Mono selected, I can select SPDIF-Out or Oculus Rift audio, but it won't let me choose speaker output from my sound card.