I have 50+ layers. Each layer is a separate video clip with audio. All layers have different lengths, and the audio in each layer ends before the its video does [there's a still image placed after the audio is over for a random amount of time **Random(that's the problem)]. I basically want to trim all the unnecessary still footage of each layer, matching the layer's length to its audio's. The audio stops, the layer ends. Is this possible to do, and how?