music in animate

so im using different music in an animation in animate. ive made a new layer and named it music. i make a black keyframe and put music on it. i want it to play for a few moments and then stop. how do i do this? i know this is a dumb question but i put it down and tried to remove all of the sound by removing the frames, whidch is usually how i get rid of frames but the music stilll plays.