Sustain point not working in-game

Wow! The lines in the lifespan graph are clickable! That absolutely makes so much sense!

So, here I can see that Voiceover Hint remains at 0.

When I audition today in FMOD Studio, I actually have the same effect, Voiceover Hint remains at 0. So there must be something wrong with it. The Volume sidechain is connected to Voiceover Hint, what else can be wrong for that not to work?

Thanks a lot for your help, joseph – I appreciate that a lot!