Doepfer

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