Ernst,

let me jump into conversation. I used to own A-102, and resonance on it is
one of the most powerful tools I ever heard. Why Cause the character of
the sound (or call it a timbre) changes when changing amount of resonance.
So it is really not about playing resonance as oscillator, but more like
"timbre modifier". I posted in this group that it is a pity that such a
powerful feature does not have CV control of resonance amount, and Mr.
Doepfer replied, and explained how this feature can be added (cause it's
nothing but the addition of one VCA to control the amount of resonance).
However, I do not have the skills to do even something simple like that - I
completely depend on manufacturers/third parties when it comes to
alteration/maintenance of my modular.

And about the sound I think I posted my opinion about that too. I generally
agree with Ingo in description of A-102 sound (never heard ASys one with
exception of couple of samples in ASys Yahoo group which really did not
impress me). I would actually discribe it like this:
- when running it with resonance down to 0, it is mildly pleasant, with no
hint of harshnes, unless you overdrive the signal
- when you start cranking up the resonance, you enter completely different
world, and it starts sounding very different. You also get tiny amount of
harshness, which might be useful or not, depending on application.

I hope this helps. Regards,

Zoran

>From: achtung_999 < heinrich.himmelwasser@... >
>Reply-To: Doepfer_a100@yahoogroups.com
>To: Doepfer_a100@yahoogroups.com
>Subject: Re: 1 Re: More EMS talk
>Date: Fri, 7 Oct 2005 02:22:43 +0200
>
>Thanks Ingo,
>
>This already helped me quite a lot.
>
>I am definately not interested in the really resonant part of these
>filters.
>But I do like the unpredictability of diode filters.
>Using filters as VCO's is not really in my book. And using a keyboard
>with a modular is rape in my opinion. Sorry, I'm weird like that.
>
>But I still would not mind recordings. ;-)
>Remember that I hardly take the resonance past 3 on my A102... I do
>mostly have the level fully open though..
>
>Thanks again Ingo,
>
>Ernst
>
>
>
>
>
>
>On 10/6/05, selfoscillate < synaptic_music@... > wrote:
> > --- In Doepfer_a100@yahoogroups.com , achtung_999
> > <heinrich.himmelwasser@g...> wrote:
> > > Never mind Ingo, I'm really busy too this week..
> > > No hurry..
> > >
> > > Greetings,
> > >
> > > Ernst
> >
> >
> > hello ernst,
> >
> > unfortunately i'm still unable to record some
> > ems/diode filter examples. i'm in the middle
> > of a remix project, actually the modular is
> > in heavy use and i cannot remove the patches
> > until the recordings are finished. sorry.
> >
> > but maybe i can give a description of the
> > differences between a102 and rs500e.
> > both filters are weird in some ways.
> >
> > the quirks on both filters:
> > increasing the resonance leads to a massive
> > level drop of the input signal, the input signal
> > starts to disappear almost completely. this can
> > be worked out by increasing the level of the
> > input signal, but this will also introduce
> > distortion to the filtered signal.
> > the resonance is frequency-dependent and the
> > tracking is bad, both is not good if you want
> > to use these filters as sine vco's or when
> > exact key-tracking is required.
> >
> > thoughts about the a102:
> > this is one of the most extreme filters.
> > the input sensitivity is very high and
> > the filter starts to oscillate with the
> > resonance knob at 9 o'clock position.
> > this means that approximately 60 percent of
> > the knob range is outside the usual limits,
> > leaving plenty of room for those
> > supernasty overdriven sounds.
> > the a102 has lots of bass when the resonance
> > is set to zero. increasing the resonance
> > somehow attenuates the low bass frequencies.
> > the filter output can be very loud.
> >
> > thoughts about the rs500e:
> > the signal input is still sensitive, but not
> > as extreme as on the a102. the filter starts
> > to oscillate with the resonance knob at
> > 2 o'clock position. this is much more common
> > than the knob scaling on the a102.
> > to my ears the rs500e sounds warmer and rounder
> > than the a102, and also a bit fatter with more
> > bass when the resonance is turned up.
> > on the other hand the rs500e cannot go into
> > the same extreme territories like the a102.
> >
> > to some extent both filters share the same
> > sound characteristics, but they are still
> > different from each other.
> > the rs500e offers a sound very similar to
> > the original ems filter, while the a102
> > sounds a bit harsher and more aggressive.
> >
> > it is also important to know about the tolerances
> > of the diodes. the selection of almost identical
> > diodes is a horror. you probably have to test a
> > hundred diodes until you find one really matching
> > pair of two diodes, and you need more than two for
> > one filter. the result is that, due to the tolerances
> > of the diodes, each filter has a slightly different
> > sound. anyway this is a fact for many other filter
> > designs too, so it is nothing to worry about.
> >
> > best wishes
> >
> > ingo
> >
> >
> >
> >
> >
> >
> >
> >
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