Hi Spine,
Thank you for your message.
Cubasis fully support AU, IAA and Audiobus 3 to load 3rd instruments and effects apps.
What format do you use to load BM3 in Cubasis?
Giving it a short check, BM3 does not appear in the list of available Inter-App Audio isntruments, neither for audio and MIDI tracks.
Which other apps fail to connect?
Thanks
Lars