Here's an example video demonstrating the copy-wave-to-variable-envelope functionality, combined with the bulge effect.

singingflowers.rm (5mb)

Notes: This is a t@b song called Derek had a Couple of Spare Lyrics. We recorded most of the parts on seperate tracks so i was able to copy the wave form of just the vocal track and paste it to the "density adjuster" variable on the bulge maker effect (f/x-effects-video-bitmap filters-distortions-bulge maker) which was a child track of the flower.