[sdiy] Odp: Pink?

mskala at ansuz.sooke.bc.ca mskala at ansuz.sooke.bc.ca
Tue Aug 21 15:52:24 CEST 2018

On Tue, 21 Aug 2018, Mattias Rickardsson wrote:
> too bright in the end. What I mean is that the VCO gets too bright and also
> too loud when opening up the filter, compared to when the filter is almost

So don't do that.  It really seems to me like your main problem is that
when you turn the knobs too far it doesn't sound the way you want, and
that has an obvious solution which does *not* have much to do with the
oscillator, let alone with a general limitation of all oscillators.

But if you want to do something more complicated, why not use two filters?
One with a fairly high cutoff and gentle slope to roll off the highs, and
another to do other tasks like applying a timbre envelope.  The
high-roll-off filter wouldn't be set up to track oscillator pitch, though
if you found this helpful you could patch it to be just lightly modulated
by the pitch CV.

So far I really think that what you want in terms of spectral changes at
different pitches is best understood as pitch-dependent filtering and
treating that as part of the VCO is not a helpful way of thinking about it.

> compensate for a problem with the VCO signal. Not really efficient! ;-)

There is no problem with the VCO signal.

> Using less resonance overall would decrease it also in the lower end.
> Introducing a cutoff-dependent resonance amount (reducing the resonance at
> higher cutoffs) is actually quite useful (and has been used successfully to
> alter the perceived character of a filter), but also has a dilemma in the
> few cases where a whistling oscillator-like sinewave *is* the expected goal.

So patch a CV-dependent resonance amount when you want it, and don't when
you don't.  That's why we have patch points.

Matthew Skala
mskala at ansuz.sooke.bc.ca                 People before principles.

More information about the Synth-diy mailing list