[sdiy] 1V/OCT

[Tim Parkhurst]

> -----Original Message-----
> From: Scott Gravenhorst [mailto:music.maker at gte.net]
> 
> Hmmm, well I disagree about the transpose point.  It happens in my 3 VCO
> FatMan with one pot.  It's just an inline rheostat to set the current for
a
> given CV.  IMHO, the real drawback of linear is that an LFO (for example)
> used to modulate pitch has a different effect depending on where the VCO
> "center" frequency is (center as in center of the effect created by the
LFO).
>  For example, if you set the LFO amplitude to give a nice effect at say
220
> Hz, it will be practically unnoticable at 3520, only 4 octaves higher.  If
> you set it for a certain effect at 3520, it will then modulate far more
> severely at 220.  Expo allows you to just sum the LFO with the pitch CV
and
> the modulation effect is the same everywhere in the range of the VCO.  In
the
> linear world, there are ways to handle this, however, basically, the LFO
> voltage is run through a VCA (controlled by the pitch CV) first.  The VCA
> output is then summed with the pitch CV and applied to the linear VCO.
The
> effect will then be the same as expected with an expo VCO.
> 
> 

Yeah, I basically meant the same thing (I was assuming the method of
transposing the VCOs would be via an applied CV), but I like your example
with the LFO a lot better.

Tim Servo

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