The linked post above describes this issue and a potential fix! The problem that I’ve been running into is that switching to AudioMixerXAudio2 on 4.18.3 doesn’t seem to actually switch it. However, switching to AudioMixerXAudio2 on 4.19.2 does. The directions are posted here:
https://forums.unrealengine.com/deve…ck-start-guide
I’m not sure why this is yet.