[sdiy] Oberheim Xpander VCF

[David Moylan]

Cool plots.  Do you have info on the mixing which causes these responses?

Dave

Andrew Simper wrote:
> 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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