Fails to open audio on 2012 MacBook Pro running Windows 7 (apps must output 4-channel audio)

[nyanpasu64]

Dn-FT fails to open a WASAPI stream to system speakers, on any sampling rate. The speakers require 4-channel audio output.

Even Audacity PortAudio WASAPI doesn't work. At this point I would blame the drivers rather than Dn-FT. However, Audacity allows you to switch to another backend to make audio work, whereas Dn-FT doesn't have fallback backends.

I don't know how Firefox Cubeb WASAPI upmixes stereo to 4-channel.