Audio Why can I not record ambisonics in Unity with Google Resonance?

I've set up Unity (2018.4.0f1 LTS) with the Google Resonance project and I'm attempting to record an ambisonic environment with the Resonance Audio Listener component - however on hitting Record, instead, I get the following error,

Code (CSharp):

1.  Failed to start soundfield recording.
2. UnityEngine.Debug:LogError(Object)
3. ResonanceAudioListener:StartSoundfieldRecorder() (at Assets/ResonanceAudio/Scripts/ResonanceAudioListener.cs:121)
4. ResonanceAudioListenerEditor:OnInspectorGUI() (at Assets/ResonanceAudio/Editor/ResonanceAudioListenerEditor.cs:108)
5. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

I've spent some time poking through the included scripts and as far as I can see the problem is located in one of the included .dlls, so I don't think I can diagnose it myself.

Kinda desperate for a solution, here, folks, as I have a very close deadline that depends on making an ambisonic recording of the experience I've built.

(I should mention that I've set up my Project Audio Settings as described in the Resonance docs)

Thank you in advance,

--Rev

 

I'd love to hear an answer on this.