Hey ingo and Peter,

If either of these have a sufficient dynamic range, why not a simple
noise gate on the output to cure the bleed through If it was applied
gently enough, I don't see where it would adversely affect the character
of the filter as the noise gate should be out of the way by the time the
envelope got back past the bleed through level. I've heard a number of
"soft" gates on noisy synth outputs to keep the noise levels down in a
studio, why not on a single module Just a thought.

Scott E.
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selfoscillate wrote:

> hello peter,
>
> the bleedthrough in vca-mode is not too loud.
> i'll try to measure it when i'm on holidays next week.
>
> on the a101/2 you cannot hear the bleeding in the other
> two modes because the module has a very low minimum
> cutoff frequency. so all the audible frequencies are
> fully attenuated when the frequency/amplitude knob
> is fully counterclockwise. at least this is what i've
> observed so far. by end of this week i'll get another
> a101/2 and then i'll do some more investigations.
>
> yes, the lpg with resonance must be close to a borg in
> lowpass mode. i really like the sound of the lpg.
> this makes me looking forward to wiards reissue of
> the borg filter. i hope that it will come out soon,
> i already have reserved some rackspace for it ;-)
>
> best wishes
>
> ingo
>
>
>
> --- In Doepfer_a100@yahoogroups.com , "(i think you can figure that
> out)" <peter@b...> wrote:
>
>>--- In Doepfer_a100@yahoogroups.com , "selfoscillate"
>><synaptic_music@y...> wrote:
>>
>>in vca mode there is always a bit of a signal feedthrough,
>>which is not noticable in the other two modes.
>>afaik this is because of the characteristics of the
>>vactrols and a known side-effect. no problem imho,
>>it's the sound that counts. now i understand why the
>>buchla lowpass gate has such a good reputation.
>>i need to buy another one soon.
>>
>>Interestingly enough, while the 291 lowpass gate does have bleed,
>
> it does
>
>>only in the other two modes, not the VCA mode. Regardless, Self
>
> speaks the
>
>>truth here. It's a quality of vatrols, the photo resistor being
>
> the cuplrit - they
>
>>don't close down all the way, never will.
>>
>>I would be interested to know the amount of bleed though. The 291
>
> is fine
>
>>when used with Buchla signal levels (basically they are line
>
> outputs), but with
>
>>Deopfer/Blacet/everybody else's in the six volt range, there's
>
> about 3mv. I've
>
>>been able to get this down to about a 1/4 of mv by throughing in a
>
> bit of
>
>>feedback in internally. It does effect the amount of ringing
>
> (which you want in
>
>>a LGP), but you can easily pre-select your vactrols so that's not a
>
> problem.
>
>>Diet: with your res pot, you've got something close a lowpass
>
> Borg filter.
>
>>- Peter
>
>
>
>
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