Please check the following two worlds:
"Office Music Video" by @MomoTheMonster
and PKCZ VR ChamberZ by myself and VR Hikky (virtual market)
These two worlds rely on Udon control of Timeline advance and start, and have several animation triggering events.
In Momo's case I believe the timeline is entirely driven by a single audio track and the animations follow along.
In my case, things are a bit complex. There are timeline drivers, animations that follow traditional animation sets, audio timed to DSP clock that drives the animation sets, and a video player (that is not providing audio).
Unlike other issues in the canny, this is not video player related, as that function is otherwise fine, (though I believe it's advanced to the last sequence in the animation).
I've enabled debugging tools on my personal copy of the ChamberZ map if you want to take a look.