[sdiy] Oberheim Xpander VCF

[Andrew Simper]

Yes I do, I will be writing a paper on it some time in the next few 
years. You can listen to the responses plotted in the synth I've done 
called Strobe.

All the best,

Andy

David Moylan wrote:
> 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
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>