[sdiy] Oberheim Xpander VCF

[David Moylan]

This type of versatility is available to cascaded integrator filters in 
general, by mixing outputs of the separate stages.  Marc Bareille 
created an add on for the MOTM-440

http://m.bareille.free.fr/modular1/vcf_multimode/extrapole.htm

Although it's nice to be able to switch in discrete steps you can 
probably have some fun with a 4 way mixer as well.

Dave

George Hearn wrote:
> I've been pointed in the direction of the Oberheim XPander VCF.  I think
> it's quite incredible how 16 filter modes can come out of one filter.  Does
> this not make it about the most versatile analogue filter design ever?  I'm
> definitely going to have a go at building an implementation of it without a
> CEM chip.  I have never heard the Xpander though for real.  Can anyone that
> has tell me what the filter sounds like?  Of most concern to me is that a
> really good 4pole lowpass can come from it.  Many thanks, George
> 
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