Help with Looping Region, Transition and Destination Markers

For a car boost sound (Please see video)

I have a loop region going until the booster parameter is at 1.
At which point I want it to jump immediately to the “Stop” sound.

I’ve got it kind of working, but there seems to be a short delay between the loop and the stop sound.
Is there something im missing?

https://youtu.be/hQmrTBLb_H4