Flash Animation 15: Starting and Stopping Sound Effects

Next, we need to insert blank keyframes marking when we want our sound to stop and start. Because one frame alone is only 1/12 of a second, that's hardly enough time for a sound effect to play; in order for it to be effective, it needs to start shortly before and end shortly after the actual frame of impact. So that's where we'll insert our keyframes: one before and one after each frame where our bouncing snowball has a keyframe depicting impact with the ground. (This means we'll skip the keyframes marking the peak of the arc of ascent.) This will create a range of time for the sound effect to play in.