I do not know whether this is a bug or missing feature, but we cannot use Get function on Avatar Audio properties. If we can Set properties on them, shouldn't we be able to Get values from them too?
What's missing:
  1. GetAvatarAudioGain()
  2. GetAvatarAudioFarRadius()
  3. GetAvatarAudioNearRadius()
  4. GetAvatarAudioVolumetricRadius()
  5. GetAvatarAudioForceSpatial()
  6. GetAvatarAudioCustomCurve()
Side note: Player Audio's Documentation does not mention anything about GetVoice...() functions.