[sdiy] How does 3320 sound as hipass/bandpass

[jh.]

> > HPF's are a different story: the harmonics from
> > overdriving the 1st
> > filter stage are *not* filtered here (as in a LPF),
> > so I think it's a good
> > choice
> > to design a HPF quite distortion free, using a
> > CEM3320 with limited
> > input level.
>
> Ding! We have a winner.
>
> Thankyou, you have clarified why I don't like the 3320
> as an LPF and why I will like it just fine as an hpf.
>
> Just out of curiosity, do you know if the Elka Synthex
> filter has any kind of magic built into the design
> that makes the 3320 sound better?  Or is it really
> just a 3320 which sounds ok, but not as good as other
> LPFs.

I'm not too familiar with the Synthex, but I know how good
my OB-8 sounds (in 4pole LPF mode), even with 3320 filters.
There's more to a synth than just its filters, and in the OB-8
the 3320 does an excellent *filtering* job - it just does no thave
the extra "add-harmonics" feature. This is more than compensated
by the OB-8's abundant variety of oscillator waveforms
(independent PWM from both VCOs, Saw's available at the
same time, and the triangle waves are a resource of many interesting
waveforms when sync'ed to the other VCO). It's always the
whole package that creates the sound, not the filter alone.
I guess the same goes for the Elka (and here you even have a
multimude filter - more than your average polysynth has, so
a lack of soft distortion can surely be tolerated).

JH.