I ran into this issue when I was trying to imitate stage lights with point lights. I made one light, then duplicated it numerous times. I wanted to make them audio-reactive so they glow in sync to audio keyframes. However, I couldn't figure out how to pick whip all of them to the audio channels without having to do it individually. In addition, I ended up modifying the expression to increase the amount of glow that would be influenced by the music. So, I had to modify each individual light's expression, which is really not a good workflow for the project I'm planning. Can anyone point me in the right direction in terms of applying the same effect to many layers (in this case lights)?
Thanks!! I appreciate it.
Various options... but at a basic level:
1. establish your expression on the first layer.
2. Select that property. [Menu] Edit > Copy with property links
3. Select all the other layers. Paste.
This will paste expressions onto the other layers that reference the property on the first layer.