Xpander/Matrix12 filter design

[A.S.P.]

He took the CEM ASP and combined it with an analog switch or a multiplexer
(CD4066 or 405x).

R>

On Thu, 27 Mar 1997 jwilmin at hzsbg01.nl.lucent.com wrote:

> 
> Howdy,
> 
> In the Oberheim Xpander/Matrix12, the cem3372 vcf/vca chip is used, right?
> This is however a 4-pole low pass vcf. How did uncle Tom manage to make all
> those other filter types with this device (high pass, band pass, combinations)??
> Or did they use other chips (or discrete designs) in addition, which I don't
> know of.
> 
> Anyone who knows how this filter section is designed??
> 
> Thanks,
> 
> Janwillem Wilmink
> 
>