I put a.wav and b.wav in the track file root. Then I use the SetTrack API to set the current track as b.wav. But When I try to export the BS I found it is the result of a.wav.
I check the current track name by GetCurrentTrack interface. It shows that the current track is still a.wav even though I just set the b.wav.
It’s wierd. It looks like that it only takes the first wav file to generate animation.