Building a Reverse Delay Audio Effect in Gen/Max - Gen~ Tutorial

A tutorial on creating a randomized reverse delay effect using the Gen~ object/platform inside MAX. I've been trying to use Gen more and more recently and this is part of me figuring it out. The principles I look at here are great for learning some of the audio-rate flow issues in Gen and sampling from a buffer in Gen.
This is a redo of an earlier tutorial that was incomplete!
A major improvement on this patch would be to do the windowing within Gen~ as I was able to do in this video: • Building a Sample Play...
I sometimes stream as I code in MAX here: / soundphenomenon