Wiardgroup

Also the Control In actually goes beyond 1 volt per octave.
The Keyboard Input resistor is 56.2K, the Control In is a 33K.

--- In wiardgroup@yahoogroups.com, "Bryan E Cornell" <bcor@l...> wrote:
>
> Hmm. Would this be true if I had the lfo going to the regular cv input and the keyboard 
cv feeding the "key" input.
> 
> Bryan
> 
> >>> grichter@a... 12/04/05 12:40 AM >>>
> That should have read bi-polar control voltage.
> A the negative half of a bi-polar LFO is at -5 volt which will move the filter down 5 
> octaves.
> The 1 or 2 octave keyboard control voltage will not be able to compensate.
> 
> --- In wiardgroup@yahoogroups.com, "Bryan E Cornell" <bcor@l...> wrote:
> >
> > Actually I disassembled the patch and now that I think about it, I may have had an lfo 
> going into the control in.  I'll experiment and report back if there is a problem.
> > 
> > Bryan
> > 
> > Bryan Cornell
> > Reference Librarian
> > Recorded Sound Reference Center
> > Motion Picture, Broadcasting and Recorded Sound Division
> > Library of Congress, Washington, DC 20540-4698
> > Phone:  (202) 707-7833
> > Fax:       (202) 707-8464
> > email:     bcor@l...
> > Usual disclaimers apply.
> > >>> grichter@a... 12/03/05 5:17 PM >>>
> > Not sure what is up with that.
> > 
> > The basic idea is simple. If you use an evelope to sweep a filter,
> > as the oscillator pitch changes, the extent of envelope sweep remains constant.
> > So high notes have fewer harmonics than low notes.
> > By adding the keyboard voltage, you move the filter with the oscillator,
> > and produce roughly the same amount of harmonics for each note across the 
keyboard.
> > 
> > The Mini-Moog has switches for this. Patching keyboard CV to "Key In" is the same as
> > having both switches down on a Mini-Moog.
> > 
> > Possible problems are a bi-polar keyboard voltage (+/-) or envelope not connected
> > to filter "Control In".
> > 
> > --- In wiardgroup@yahoogroups.com, "Bryan E Cornell" <bcor@l...> wrote:
> > >
> > > I'm having a bit of a problem (I think) with the key input of my Boogie filter.  I 
> assumed 
> > that you are meant to plug a keyboard cv in here so that the filter will follow the 
> keyboard.  
> > Is this correct?  When I tried this, all my low notes were very quiet and the high notes 
> were 
> > loud, resonant, and buzzy. When I unplugged the keyboard cv from the key input on 
the 
> > Boogie Filter the tone and volume were much more even across the range of the 
> keyboard.  
> > My patch was simple: keyboard CV to mult so it could be fed simultaneously to the 
> > oscillator and the filter.  The rest of the patch was the gate out of the keyboard to an 
EG 
> > and to the VCA into which I had plugged the output of the filter.
> > > 
> > > I feel like I'm missing something fundamental.
> > > 
> > > Bryan
> > > 
> > > Bryan Cornell
> > > Reference Librarian
> > > Recorded Sound Reference Center
> > > Motion Picture, Broadcasting and Recorded Sound Division
> > > Library of Congress, Washington, DC 20540-4698
> > > Phone:  (202) 707-7833
> > > Fax:       (202) 707-8464
> > > email:     bcor@l...
> > > Usual disclaimers apply.
> > >
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  
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> >
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