PG Music added some midi routing functionality during 2016 so it is important that your version of Band-in-a-Box is current. The current English language build is 438.
Summary of Changes for Version 2016 Build 438 (Sept 12, 2016)
Added: Improved support for time-based VST plugin features. VST plugins (such as JamStix, Addictive Drums, EZ Drummer, and RapidComposer) were previously not receiving MIDI synchronization information from Band-in-a-Box (eg. tempo, play/stop, song position, loop positions). This allows, for example, plugins like JamStix Virtual Drummer to generate and play drum arrangements in real-time.
+++ Build 438 +++