[sdiy] RE: cross-fades (was ...)

[Tim Ressel]

The That VCAs have + and - CV inputs. Cross-fade nirvana?

http://www.thatcorp.com/datashts/dn120.pdf

--TimR


--- On Thu, 1/15/09, John Mahoney <jmahoney at gate.net> wrote:

> From: John Mahoney <jmahoney at gate.net>
> Subject: [sdiy] RE: cross-fades (was ...)
> To: synth-diy at dropmix.xs4all.nl
> Date: Thursday, January 15, 2009, 2:25 PM
> At 04:26 PM 1/15/2009, David G. Dixon wrote:
> >This talk of VCFs has led me to another newbie
> question:
> >
> >What is the preferred method for implementing a
> cross-fade circuit?  I'm
> >assuming one channel's gain is increased from 0 to
> 1 while another's is
> >decreased from 1 to 0, and they both add up to one at
> any given setting?
> >How exactly is this done (it doesn't involve
> dual-gang pots, does it?  That
> >wouldn't be elegant at all!)?
> 
> Passive approach requires a ganged pot.
> 
> Active approach uses VCAs. One channel gets an
> inverted-and-offset 
> form of the control voltage.
> 
> Vactrols may be another possibility.
> 
> John 
> 
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