ASM-1 VCF "external" audio input?

[Brett Duggan]

Hi guys,

I was considering making a decidated standalone VCF device out of an ASM-1
PCB (utilizing the VCF, 1 VCA, and an ASDR for each of them) for
processing mic/guitar level to line level signals.  Problem is, I don't
know how to design the input circuit that would be necessary to knock the
signal down to the level needed by the ASM-1 VCF.  Has anyone here
designed such a circuit yet, or considered it?  Or is such a circuit
pretty generic and therefore fairly easy to find info on?  I'm hoping to
be able to intentionally overdrive the VCF if enough gain is cranked back
into it.  I assume the input impedance would need to be pretty high, up to
1 Megaohm I think. 

Can anyone help me out in some way?  Thanks very much if you can!
Brett D