second shutdown sound eithter .... or ?

Hello to all
This question concerns to helicopter sound.cfg

Due to that i have created a second shutdown2 sound from idle rotor run which is 7 sec shorter than the original "shutdown1"
i wonder how i tell the sound.cfg to play either the original "shutdown1" straight at full Rotor run
or the other shorter second "shutdown2" when i throttle down to idle rotor run. ?
( Heli has one Engine ! )

reason is : when you shut down from iddle, the rotor annimation is about 8 sec. shorter !

it concerns the Aerosoft Huey X sound.cfg
( i can post sound.cfg sections if necessary :) )

witch entrys are nessosary in the sound.cfg
THX for your help in advance