Multiple output busses for VST (not VSTi)

I want to create an FX plugin with stereo input, stereo output and a mono aux output bus with the new multi-bus features from JUCE 4. Therefore, I have created an example plugin which loads fine, but I cannot access the aux output bus in Cubase or Nuende. Are there any routing tricks I do not know or is it impossible?

When I create a synth plugin without audio input it I can enable the additional busses in the VSTi overview window.

I’m not sure if Cubase/Nuendo supports this. But it might be worth to try to set the following macro on line JUCE/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp:1575 to 1. Please let me know if that fixes the problem.

I tried this but still no additional bus appears in the mixer when the plugin is loaded. However, I am not sure if I did something wrong or if it simply is impossible with the routing possibilities from Cubase.

Any Cubase experts?

Hi- were you ever able to find if it’s possible to do this for VST, without making it a VSTi?