ASM-1 VCF "external" audio input?

[Andrew Schrock]

Brett, 

The ASM-1 VCF sounds kinda bad overdriven... it clips easily and generally
doesn't sound very "rough". (no offense to anybody out there) Actually, I
had the same question when I first built mine. The filter is very
utilitarian, and I use it all the time in series with my sh-101, but it's
really not too good for getting that overdriven filter sound. 

Tony Allgood makes a _very_ nice VCF PCB. Mine is currently in the
assembly stages, but I can tell you that the PCB looks absolute top rate.
Plated through holes, very nice design w/silkscreen, etc. Definitely worth
the money.. it's a moog transistor ladder filter design, and can be
overdriven quite nicely. (or so I'm told) I should be ready to do a proper
review of it after new years and it's all built. 

Moog transistor ladder designs are pretty nice.. very smooth response, but
if you're trying to get that aphex twin feel, get a few CEM 3320's!
(they're still pretty cheap) 

I put an attenuator on the inputs to my ASM-1 VCF, and this brings the
signal down to a managable voltage. (of course in series with the asm-1's
audio inputs..) 

Andrew

| Andrew Schrock							|
| Network Programmer, Synthesizer and electronic music enthusiast	|
| aschrock at cs.brandeis.edu						|

On Tue, 8 Dec 1998, Brett Duggan wrote:
> 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
> 
>