WHY WON'T IT WORK?

This is the post that I wanted to put up last night, but, due to Youtube being useless, it's had to wait until today.

Anyway, having spent a while checking out every schematic on Tim Escobedo's site, I decided to have a go at messing around with the PWM, which turned out to be masses of fun. At the moment, it has an envelope which controls both the speed and depth of a tremolo simultaneously. The tremolo, in turn, is controlling the pulse width.

Confused? so am I, here's a video of what  I've got so far: