For Drew especially but anyone else who's interested in the Zylia after some digging I eventually found the pages with the really
interesting info here
Zylia comes really close to what I want, but ultimately fails largely because of the channels-per-track restriction Hugh noted. There's more to it than that, however. There's two versions of the app, the basic and the pro. The basic app is standalone and is responsible for making the actual recording and afterwards can export individual tracks for each "virtual microphone" that can be loaded into a DAW like Logic. Unfortunately and rather bizarrely you have to set up the virtual mics before
you start recording. This completely cuts away the whole point of ambisonic recording for me which is the post hoc ability to change your virtual mic placement. Consider the following usage, a ring of people singing or playing instruments (my particular case a group of shanty singers) with the ambisonic mic in the middle. I would want to make the recording and then depending on who is actually leading the shanty at that moment set up my virtual mics accordingly. You can't do that with the Zylia basic, you'd have to rejig the recording setup each time before you start recording.
The Zylia basic app sort of works for their suggested usage, people rehearsing in a fixed and predetermined arrangement but for any real world usage - nah. I think this restriction is only present to justify the very much more expensive Zylia pro app which can do post hoc selection of virtual mics and work as a plugin within your DAW, but only if your DAW can handle single tracks with a minimum
of 19 channels. As Hugh points out Logic can't do this. I don't know about other DAWs but as I noted above they specify either Reader or Ardor only in their minimum requirements.
So there we are. Shame really.