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You are now familiar with the Audio Editor controls and the Level curve. Your goal in this exercise is to fade in the Bumper Sirens audio at the beginning of the project, and fade it out at the end. You can accomplish this goal by keyframing the Level curve in the Audio Editor. What's keyframing? Great question. Keyframing is the process of assigning a specific parameter value to a specific frame. Why? So that the values can change over time. If the values on the Level curve change, the curve bends to show the different values over time. For example, to fade in an audio track, you can assign the audio level a value of 96 dB (the lowest audio level) at the first frame of the track, and a value of 0 dB 1 second later in the track. The result when you play the track is that it will start silent and gradually fade up to a normal volume level of 0 dB 1 second later. Let's try it. First, though, you need to learn how to set a keyframe. There are many ways to set keyframes in Motion. For this exercise, you'll set keyframes in the Audio Editor controls and on the curve itself. Let's start with the Audio Editor controls.
That wasn't so difficult. You can also use the keyframe pop-up menu to delete keyframes by choosing Delete Keyframe from the menu. |
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