The ear response to sound pressure levels (amplitude) in a log (anti-log?)
fashion is way similar to the way pitch works.
You know how, in a VCO, you have the choice of designing it to either
respond exponentially to linear CVs (the Moog/MOTM way) or to respond
linearly to exponential CVs (the Korg MS-series way).
Same goes for a VCA. It's usually cheaper and more direct to design an
amplifier that responds linearly to an exponential control contour,
especially since ADSR envelopes are usually created from charging capacitors
which tend to exhibit the exp. curve anyway. But it doesn't have to be that
way.
However, let's say you want to use the VCA to control something other than
an audio signal. What if you want to use a CV to control the gain of another
CV, in other words, use the VCA as a voltage-controlled resistor? Then you
most likely will want to use a linear CV in and a linear response to it.
If I'm wrong, somebody hit me with a wet noodle. It's late on a Friday and
I'm not thinking properly. Something in what I just wrote doesn't ring right
but I'm too brain dead to troubleshoot it.
I know what it is. It's ANTI-log, right? So you need the exp. response to a
linear CV if you aren't using a CV input from an AL source such as an EG.
I give up, what's the answer?
-----Original Message-----
From:J. Larry Hendry [mailto:
jlarryh@...]
What would I use a linear input on a VCA for unless I was
using EGs with
linear CV outs?