AE doesn’t do raytracing – you have to duplicate your layer and turn it up-side down to fake the reflection.
To have the reflection falloff you can simply add a mask with feather or better create a new solid on top of your reflection layer with a black&white ramp applied. Then set your reflection layer to use the ramp layer as a luma matte. Add some blur for greater realism.
I am not sure if I have seen this effect,
but I would check out Trapcode sound keys. You can link any keyframeable attribute to the peak levels of an audio file.
I am not sure if I have seen this effect,
but I would check out Trapcode sound keys. You can link any keyframeable attribute to the peak levels of an audio file.