Ambisonic Export with 4 Channels

Have you had a chance to check out Penn State's guide on multi-channel audio in Premiere Pro?

Ambisonic_in_Premiere.pdf (willyurman.com)

Muilti-channal export is supproted;  however, it requires that the Sequence settings be configured for it at the time it is created.  If you've already done your edit, you can copy and paste from a Stereo Sequence to a Multi-channel Sequence and continue your audio mix from there.