My thougths on self oscilations:
In analog circuits there is always some noise present (thermic noise at least) 
whichs excites the filter .In the digital world if you have zero you have 
zero,and how much you try to amplify and filter zero you still get zero, so 
you must have something to excite the filter, you could try with some low 
level noise to simulate the thermic noise maybe

Roger

> > > Does the moogvcf opcode self-oscillate? I am under the impression that
> > > no digital filter self-oscillates without an initial source of
> > > excitation, but I could be wrong.
> >
> > It does self-oscillate, yes. I think that the moogvcf is not a classical
> > digital filter, it's a simulation of an analog circuit filter
> 
> I wonder, though, if it truly self-oscillates - in other words, can you
> use it with no input, as a sine wave source, like a real Moog filter? I
> guess I could try it out.
>