I’m using the pseudo 5.1 technique as described the fmod documentation where I have added two silent channels to the AmbiX file, and added the Oculus Ambisonics effect on the master track. Both FMOD and Unity are set to 5.1 surround, and in Unity i’m using the oculus spatializer.
However in Unity, when I turn my head there is one area where the audio just dips in volume. Once I move past the area the audio returns to normal volume.