If I use IEM or DeerVR to export an ambix file as binaural, the render completes as expected but when I bring it back in to WL it still shows shows 4 tracks, two of which are silent.
I have the ambisonic plugin on the master in montage and I set my playback channel config to Ambisonics → 1OA (4 channels) and then set my speaker layout as:
It is easy to get your multi to a Montage by opening it in the Audio Editor, clicking on tab and creating montage through the Audio Editor. You can also use your plugin in the Audio Editor and render to stereo file.
If you are adding individual files to montage, here is one way to render a 4-channel montage to a stereo file. You can pan if you want to, through track routing. where for the third clip you can see pan is centered.
You can also try below Track Send Option for Pan/Stereo - disable bottom channel and sending only top channel to left or right or Left and Right.
Or you can render stereo through this menu (picture below) without changing Montage Properties - Through Edit Single Format Menu