It's never worked for me.
It should work like Reaper's smooth seek, this will transition smoothly from one bar to another.
Biab has midi chord input detection (Window > MIDI Chord Detection), if Biab could smooth seek it could be used as a live arranger right NOW, simply by going to that same chord region in the chord sheet that is inputted with a midi keyboard, let alone conductor working properly.

To do any of this now you are best to use the BBPlugin in Reaper as you can use midi input/foot pedal to go to any section.
How Reaper works now with Instructions in the Plugin makes it even easier as it will play the wma/wav source files directly and transition smoothly from any bar to any bar. You can even have more than one Plugin to give you a lot more playing material and chords that you are normally limited to 255 bars in the main Biab app, having Tabs in Reaper you can have as many songs as you like that you can instantly change to.

Reaper-BB-Tracks-Arranger.mp4

https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly