To @VV1 and everyone who intends to use Vienna MIR Pro 3D as a panning device for mono- or stereo-to-multichannel tracks: Cubase and Nuendo seem to need a dirty workaround that makes sure this very peculiar implementation works reliably:
Please create a plain audio-track with the intended channel count / intended fomat (e.g. 3rd Order Ambisonics) as a dummy and move it to the top of the project (i.e. “Track 1”). Now instantiate MIR 3D as a conventional insert effect in this channel before (!) starting to add other instances as panning devices in the following tracks. You can hide this dummy instance in Nuendo as well as in MIR 3D itself, but it must not be deactivated, bypassed, deleted or moved from the top position of the track list. - When re-loading a project Nuendo will now “tell” MIR 3D about its intended format right from the beginning, before the mono- or stereo-tracks’ panners interfere with the actual format settings.
HTH,
/Dietz