As you posted in
https://forum.cockos.com/showpost.ph...73&postcount=7 , 16ch opus works.
Reaper ALREADY supports 16ch opus export.
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If you want NEW, SPECIFIC ambisonics support, this is the WRONG forum to post in for NEW FEATURE REQUESTS. Report your own thread to have it moved here.
https://forum.cockos.com/forumdisplay.php?f=23