Audiorender and positioning of ambisonics sound

Hi I am using ambisonic sound recordings with an openvr headset. I have the 4 channel ambix b recordings going into audiorender which is sending out the 16 ambisonics channels which should be positioned around the listener in 360 degrees. The audiorender guide says:

“The Ambisonics format used in the Audio Render CHOP is the 3rd order SN3D format consisting of 16 encoded channels (WXYZ, RSTUV, KLMNOPQ) that define the sphere of sound. Custom Setup requires use of the Mapping Table.”

I don’t know how to assign the channels to the right 3d positions. I can only hear the sound in mono. The statement above seems to suggest that I don’t need to map the sound positions manually as I am not creating a custom setup.