Vertigo VSM-2 Distortion Circuits?

[ohthepain]

I have been experimenting with distortion circuits that sound good on things other than guitars. Was wondering if anybody knows what distortion circuits are used in the Vertigo VSM-2? I am interested in the FET Crusher and Zener Blender circuits.

There are a lot of circuits in that unit but I am just wondering about their basic distortion circuits.
Cheers!