[sdiy] Obtaining Bandpass and High-Pass Functions From A Four-Pole Low-Pass

[Florian Anwander]

Hello

Am 15.10.18 um 20:50 schrieb S Ridley:
> It had a 4 pole cascaded 3080 VCF and derived a 4p highpass and a 
> bandpass from it.  That was around 1980.
How should a bandpass work this way? If the highpass is not a real 
highpass but the result of a treatment of the lowpassignal, then you 
cannot put the highpass after or in front of the lowpass - at least to 
my understanding.

Florian