Nuendo 11 Atmos "Object Beds"

Yes.

What I did was as I said send from the source mono audio track to a group track. On that group I used Stratus 3D and the group is 7.1.4. Then I can make that group into an object.

Because the source audio track is panning correctly it’ll feed signal just fine into the group and Stratus show how the input signal follows perfectly in all channels. The renderer then shows the same signal following correctly: