The Heavy Drop is a sub-tool to the Pool Tool. it uses an original Pool as starting point to describe why an excerpt of music is special. That special excerpt is the Heavy Drop.
Pool + explanation of difference with audio excerpt => Heavy Drop
Main characteristic of the Heavy Drop is that you listen to both the Pool and the Heavy Drop in the same way. But from this common listening disposition, the Heavy Drop redirects the perception. The nature of the redirection (= difference) is described in words. It is what makes the Heavy Drop special.
Illustration: white circles are the Pool, arrow is words, black circle is the Heavy Drop