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VCA in exponential mode
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Wed Mar 05, 2008 8:01 am    Post subject: VCA in exponential mode Reply with quote  Mark this post and the followings unread

Hi,

can anybody throw a sample which could illustrate an interesting use of VCAs in exponential mode (i.e. not LINEAR) ?

On each vca I build, I always add a switch for LIN/EXP mode but I have to admit they always stay in the upper position.

...

EXP is better for percussive sounds !?

linear adsr with exp vca, exp adsr go with linear vca...

i'm lost and (sadly) unconvinced.
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yusynth



Joined: Nov 24, 2005
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Location: France

PostPosted: Wed Mar 05, 2008 9:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Personally, the only useful use of the expo mode in a VCA is for using MIDI velocity CV to modulate the output of an ADSR EG
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etaoin



Joined: Jun 30, 2005
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Location: Utrecht, NL

PostPosted: Wed Mar 05, 2008 10:46 am    Post subject: Reply with quote  Mark this post and the followings unread

I always use my VCA in log mode when connected to my ADSR. I seem to have better control that way (Yusynth ADSR to MFOS log/lin VCA).

By the way, are we mixing exp and log or are there three types of VCAs, log, lin and exp?

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widdly



Joined: Jun 25, 2007
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PostPosted: Wed Mar 05, 2008 7:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Exponential VCA are handy for tremolo and panning.
Last edited by widdly on Thu Aug 05, 2010 10:19 pm; edited 1 time in total
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Coriolis



Joined: Apr 11, 2005
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PostPosted: Thu Mar 06, 2008 3:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
By the way, are we mixing exp and log or are there three types of VCAs, log, lin and exp?


Wikipedia says the expo function is the inverse of the log function, so if Ray Wilsons vca's really are log (and not exp), and exponential vca'a are good for tremolo and panning, that explains why I get better tremolo out of the lin setting of my Ray Wilson vca's than with the log setting. Actually, I haven't yet found the log setting useful for anything, and pretty hard to set up interms of the cv-offset control.

This log/exp thing has had me confused too...

C[/quote]
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Thu Mar 06, 2008 9:37 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you for answering.

that's an interesting use yves...

As you coriolis i've found cv-offset control to behave strangely, anyway...not the same.


Etaoin, won't your eg sound as "thin peaks" in this mode ?

Has anyone try the EnvyLope/Papareil Linear ADSR EG ?


http://m.bareille.free.fr/modular1/adsr/mb_cvadsr2.htm


(your samples sound so quiet Laughing )
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Dave Kendall



Joined: May 26, 2007
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PostPosted: Thu Mar 06, 2008 1:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah - I'm a bit confused too scratch

I'm assuming that normally, lin, log and expo refer to the effect on the input signal of *any* VCA when controlled by a linear CV..... (?)

As an aside, I've seen some pan pots described as "equal power" - Mackie stuff used to mention that IIRC. Would that be log or expo or something else?

cheers,
Dave

(- edited to remove the effect of beer just before posting Wink

Last edited by Dave Kendall on Thu Mar 06, 2008 4:59 pm; edited 1 time in total
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etaoin



Joined: Jun 30, 2005
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PostPosted: Thu Mar 06, 2008 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ray has pictures of what he calls lin and log on his VCA.
This log looks suspiciously exponential to me.

MFOS lin:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

MFOS log:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

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