@Shmank add a separate Circle/Sphere Collider for your StudioEventEmitter, set it to Is Trigger = true and make it as big as the sound size that your Event has (eg. Radius = 20f).
Then on the StudioEventEmitter you can (as @richard_simms mentioned) set the FMOD event to start playing in OnTriggerEnter and stop playing in OnTriggerExit.
