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Re-encode multichannel recordings to HOA

What would be a good strategy to re-encode multichannel recordings to ambisonics B-format, and then to binaural?

The use-cases are:

  1. decode Eigenmike recordings
  2. re-encode recordings of the direct-to-speaker output of spat to be listened to in a different LSP setup or binaurally

For 1. I have found the mh-acoustics plugins, but would like to know how this can work in spat/panoramix.
For 2., which seems to be the common practice, I wonder if recording directly to B-format could be advantageous.

I’m looking for pointers and solutions in spat, panoramix, and possibly Reaper for offline processing. Thanks!