...why wouldnt people want that level of accuracy when animating, especially when working to music at a specific duration? Because often people are animating to words or beats in the music. Music is rarely performed with a computer-precise beat and tempo. Musicians aren't robots: they swing the beat sometimes. They use rubato. They change tempo. They change time signatures. As a result, you have to FIND those words and beats. It's not a situation where you can say, "There! I've found the duration of one beat! Now it's easy to find the rest of them!" If you try it, you will be very disappointed. Try finding the precise end of a piece of music that fades or ends on a big chord with a ring-out. You'll see that it's trial-and-error: what's the point where it becomes inaudible? It depends on how high your speakers are turned up. You might have them way up, you set an end point for the layer, and then you do a RAM Preview at a more reasonable volume. You might say, "Hey! The music ends before the layer ends!"... but you KNOW you set the layer's out point when the audio file goes silent. AE has layer markers that can be used on an audio layer to mark beats, words, etc. They come in very handy. I guess it comes down to this: because AE can do so much different stuff, there are very few automated procedures. Oh, Adobe tries with effects that convert audio levels to keyframes, but they're not 100% reliable... especially on something like a capella choral works. For true accuracy, you need find the timings yourself. If you want something simpler, try a different application. But be prepared for lower level of accuracy.
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