sound not stopping

i am creating a power up system , when my character overlap the box collision a sound need to play , it is a 10 second .wav music file , but if character step out of the box collision the sound need to stop immediately , but hear sound dosnt stop . what is wrong with my code ?

Use Stop:

i used stop node and still the sound is playing , the sound file is 10 second long and i need it to stop immediately when i end overlapping

Have you got something else overlapping?