I use the Band in a box VST3 plugin. I just tried it and it worked fine.

Steps in Studio One:

Create in Studio One a "new Record and Mix"
Click Instruments then PGMusic
Drag BIAB DAW Vst3 onto timeline
Click Find and locate your saved song
Open
Generate
Drag "All" button onto your Studio One onto your timeline

Not sure if your way will work.

...Deb