How the $@#! do you FM mod a ladder filter?

[cyborg0 at GlobalEyes.net]

Okay, I need to know some of the basics and caveats of FMing a ladder
filter. Where do I inject the signal? It would make sense to inject it
into the cutoff CV, but, could it cause damage? i know i should prlly
put an attenuation pot in there and a coupling cap, but it seems there
would be more to it..any answers?

	also, how does one identify where the poles are? can the response of
these be manipulated as in the Jomox Sunsyn? 
rob