The segments overlap and produce a jumbled sound. You need to adjust
the timing so each plays back at a more logical part in the animation.Synchronize the audio with the animation:
1 On the Dope Sheet toolbar, click Edit Ranges.2 Click the start_engine.wav range bar and move it left and right to see how
you can reposition the audio segment anywhere on the timeline.You need to reposition the start_engine segment to coincide with the
part in the scene animation where the biplane propeller starts to turn.3 Move the Dope Sheet window until the Camera01 viewport is visible.
4 Drag the time slider until you see the propeller start to pick up speed,
which is around frame 50.