This is a built-in feature that is meant for fading out a music track at the end of the video. If you are using a voice over that you recorded, using your own software, leave just a couple seconds of "dead air" before you stop recording. If using the Instant Audio Hotline, once you finish speaking, leave exactly 2 seconds of "dead air" before hanging up. If you wait too long, the recorder will think you are finished and will take out that dead spot.
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