[sdiy] Oberheim Xpander VCF

[Andrew Simper]

And you can get many more responses than the ones in the oberheim 
xpander service manual, one of my favorites is -12 st Notch, 0 st 
Resonant peak, +12 st Notch called N2P2N2T (T for twin or tripple in 
this case)

Here are some plots:
http://www.vellocet.com/dsp/CascadedFilterResponses/

Andy

Antti Huovilainen wrote:
> On Thu, 15 Jan 2009, 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?
>
> You can get the same modes (and over a dozen more) from any 4 pole 
> cascaded RC style filter (Moog ladder, CEM, OTA etc).
>
> Antti
>
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>   -- Lt. Cmdr. Ivanova
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