Possible to access Unity's internal FMOD or AudioUnit instance (if Unity uses iOS AudioUnit)?

The plugin for the full 'FMOD Studio' seems to have a public handle to it's instance but does anyone know if there's any way to access the FMOD object (singleton or however it's structured) in the regular FMOD built into Unity either Unity or native objc side?

Background:
I'd like to save game audio in realtime and synch it up with an AVAssetwriter video recording of gameplay which is done in native iOS code, ultimately creating a screen capture with sound of the Unity scene. So I need access to the stream of audio data, I see that FMOD allows access to output buffers so I thought that would be a good place to try and hook in but there's seemingly very little that's publicly exposed of the FMOD system in Unity and I can't find anything helpful in docs or online.

Alternatively, I'm not sure how the whole system is wrapped up in iOS, I would think using AudioUnits or an AUGraph, but maybe there's some way to get a reference to and read out of whatever Obj-c class is being utilised to run the FMOD system. AudioUnits allow access to live buffer data too so that could work.

Backup would be to stream the data from the AudioFilter in Unity either to file or passing through to Obj-c on the fly but would be a bit more work. Hoping there's a way to get at the audio stream directly from Xcode...

 

Did you ever get a solution to this?

 

@PDZ I didn't find a way to intercept Unity audio on the native side but did write / adapt code to catch it Unity-side. Check out the open source for iVidCapPro for an example of approach. I then used native functions to combine the recorded audio from Unity and captured video from native.