MOTM

And, I like MOTM-320 sync-fed from a divided pulse (120 or others)
Larry

----- Original Message ----- 
From: Mike Marsh <mmarsh@...>
a) MOTM 120
b) Larry's module (tune your osc down 1, 2, or 3 octaves)
c) tune an extra osc down a couple of octaves and feed it in

I'm sure there's others (self-resonanting filters come to mind), as 
folks will probably chime in.

Mike