Flowgraph - pacenotes

Hi. I wanted to add pacenotes to one of the rally scenarios on American Road map using the flowgraph. It works, but only when I hit "play" button in the flowgraph. How can I activate the flowgraph at the start of the scenario? Thanks!

Edit:
Or maybe there is an easier way to do this. All I need is a 2D sound that will play one time when player enters the trigger.

 

See here

And please consider sharing them once you're done!
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From minute 15