[sdiy] Yet another 292c Lowpass Gate audio sample uplaoded

[petergrenader]

Check the Perkin Elmer site and look up the data sheet for the 2's.  If I
remember correctly, the major difference is in its resistance range.

It may have been in a conversation with Grant or Lightner or Mark, but I
remember something about it not being the best of ideas, as I have one of
the 'off' models as well and ask (one of them) about it.

hope this helps,

P



on 10/15/02 12:06 PM, Scott Stites at scottnoanh at peoplepc.com wrote:

> Hi,
> I've been wondering - has anyone tried any Vactrols other than the VTL5C3 or
> VTL5C3/2 with the Low Pass Gate?  Specifically, I have some VTL5C2's on
> hand.  I figure that (obviously) different Vactrols will give quite
> different response curves.  Question is, is this a good, bad or 'beauty is
> in the eye of the beer holder' type of response?
> 
> Keith, Mark, Peter - ever tried this?
> 
> Thanks,
> Scott
> 
> 
> ----- Original Message -----
> From: Peter Grenader <petergrenader at mksound.com>
> To: <synth-diy at dropmix.xs4all.nl>; <keithw at cix.compulink.co.uk>
> Sent: Monday, October 14, 2002 11:28 PM
> Subject: [sdiy] Yet another 292c Lowpass Gate audio sample uplaoded
> 
> 
>> Peoples,
>> 
>> To augment Mr. Winstanley's Lowpass Gate soundfile, I have added one of my
>> own to my site which gives an example of the 292c circuit controlled by an
>> extremely short transcient-type  envelope.
>> 
>> Two things will be instantly evident when you hear it:
>> 
>> 1)  No pop.  Do the same thing using a standard VCA,  with an envelope as
>> short as the one I have used and the usual VCA crack*pop*snap will be
> heard
>> as it opens and reacts to the voltage applied.  The vactrol in the lowpass
>> gate by comparison affords a slight smoothing of control voltages as the
> led
>> turns on.
>> 
>> 2) The ringing in 'combo' mode.  When the Low pass gate is set so that the
>> switch is on the middle position, one hears a mix of the standard VCA and
>> the low pass gate in equal amouts.  The net effect of this is a
> wonderfully
>> natural sounding ringing  which is very audiblet with short envelopes like
>> I've used here  Chalk this up to the vactrol LED now dimming off and the
>> removal of the .0047 cap within the circuit.
>> 
>> In the ate used in this sample I used polystyrene's for all caps which are
>> directly related to the audio path. The other two are combinations of
>> different types of caps in these places which was done intentionally to
> give
>> each a slightly different persoanlity.  I can't tel from Kieth's picture
>> which type are on his, but they sound like mylars (one of mine uses those
> as
>> well).
>> 
>> Another application hint for the lowpass gate is setting the output level
> of
>> the control source you're using to open it with to the bare minimum
> required
>> to turn on the led in the vactrol - just a touch past the signal being too
>> low to excite and open the gate.  I usually use my Blacet EGs for the
> LPGs,
>> where John's output level pots come in very handy for just this.  Using
> too
>> much juice will cause a little clipping.  Backing it off will yield what
>> you'll hear in this sample.  I assume this is due to the signal levels of
>> the Buchla the circuit was designed for.
>> 
>> To give this a listen, go here:
>> 
>> http://www.allegrobikes.com/synth.html
>> 
>> click on 'Son of Frankensynth"
>> 
>> Scroll down to Homebrew modules link
>> 
>> Scroll down to the Low Pass Gate listing on that new page
>> 
>> click on the 'submit to the LPG' button and you will be directed the the
>> correct download link for the soundfile.
>> 
>> To jump there immediately, simply go to:
>> 
>> www.allegrobikes.com/lpg.html
>> 
>> enjoy.
>> 
>> or not.
>> 
>> P
>> 
>> 
>> 
>