Simple but important Pre-Resonace on SSM and Envelope Slope Questions

[Harry Bissell]

Could be that your waldorf is emulating (or is???) a state variable filter, vs
the moog filter like structure of the SSM chip.

The state vatiable has equal gain in the pass band with and without
resonance.... the resonant peak gets louder with higher "Q".
The moog filter has resonant peak equal to the normal passband, the pass band
gets attenuated with higher "Q"

So the State Variable actually gets higher in amplitude peak... while the moog
gets quieter in the pass band...

This would hit harder all right...

(this is true but in your case ??? I dont know ????)

H^)   Harry

|||| Philip |||| wrote:

> Hi all,
>
> I was just trying to emulate my DK-600's 2044 SSM filter sound on my Waldorf
> MicrowaveII. It comes close however the Self resonance on the MWII hits
> very hard and fast over a range of about 1/20th knob sweep. It goes from
> almost nothing to 100%. On the DK-600, this pre-selfresonance range is about
> 1/4 of the sweep and is simply the best sounding range to be in. In this
> area the filters starts to go high pass and hints of self resonace cause the
> sound to sparkle.
>
> Can anyone explain exactly what is happening to the frequency spectrum as
> self resonance is approached ? Can you reference this to filter circuit
> behaviour if possible?
>
> Also, the MWII has fast envelopes but they have linear slopes. I prefer the
> slopes of other synths that I guess are log/exp. Can anyone explain why
> these slopes sound better. Is there an advantage of one over the other?
>
> Thanks
> Philip