Doepfer

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@yahoo.com> 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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