PLAN B analog blog

When VCAs gate the control voltage, if for instance the control voltage is
static - let's say a steady 5 volts, the attenuation effects that static
level by rising up as the CV fades into one of the output channels and then
tapering down as it decays to another output channel.  To each of the output
channels of the panner, it would effectively be like turning a voltage pot
from ground up to 5 volts then back down again to ground, so it that regard
it acts like a slew.

If the pan is immediate -  if it jumps instantly from one output to another
then this slew is minimized - the net effect is like an analog switch. A
clean break if you will.  But as the movement from one channel to another is
gradual, the slewing effect will be noticeable.  This may not be a bad thing
mind you, but it is an unavoidable attribute of gating control voltages.

- P



selfoscillate wrote:

> 
> 
> 
> hello peter,
> 
> hmm i really don't know. actually i use linear vca's
> like the a132 or blacet dual vca for panning of control
> voltages and that seems to work fine. these can process
> both audio and cv without problems. can you please explain
> the difference between your panning vca and devices like
> a132 and the blacet dual vca? sorry if this is a dumb question ;-)
> 
> best wishes
> 
> ingo
> 
> 
> 
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure
> that out)" <peter@b...> wrote:
>> 
>> Well, it could, but there is a problem with this idea one must
>> consider:
>> 
>> In order to pan audio, to avoid clicks and dead spots one needs
>> the transistion to be gradual, even if ever-so-slightly.  This is
> fine 
>> for an audio signal.  For a control voltge however, this
>> dramatically changes the control voltage being panned, much
>> like the effect when one gates a DC thorugh a lowpass gate - the
>> vactrol makes for a really nice ring of the audio due to the fact
>> those devices close down slowly - with a CV however you get the
>> very same effect as running the CV through a slew.
>> 
>> Any thoughts on this?
>> 
>> - P
>> 
>> 
>> 
>> 
>> --- In PLAN_B_analog_blog@yahoogroups.com, "selfoscillate"
>> <synaptic_music@y...> wrote:
>>> 
>>> 
>>> hello peter,
>>> 
>>> i'd love that vc quad panner too, but it should be
>>> able to handle dc voltages and not only audio.
>>> 
>>> best wishes
>>> 
>>> ingo
>>> 
>>> p.s. nice idea to start a dedicated plan b group :-)
>>> 
>>> 
>>> 
>>> --- In PLAN_B_analog_blog@yahoogroups.com, "(i think you
>> can figure 
>>> that out)" <peter@b...> wrote:
>>>> 
>>>> VC Quad panner as a stand alone sounds like a great idea,
>>>> actually.  Let me give that some serious thought.  Again, if
>>>> enough people say 'yeah', it's a win win for everybody.
>>>> 
>>>> Thanks for this (good) idea.
>>>> 
>>>> - P
>>>> 
>>>> --- In PLAN_B_analog_blog@yahoogroups.com, Robert
>>>> Hoffman <robmix@e...> wrote:
>>>>> Maybe there's two separate modules, the Balanced Stereo
>>>> Output, which 
>>>>> I'm all for - sign me up, and a VC Quad panner.
>>>>> 
>>>>> Rob
>>>>> 
>>>>> 
>>>>> 
>>>>> On Monday, October 4, 2004, at 01:17 PM, Johan Boberg
>> wrote:
>>>>> 
>>>>>> About the proposed Balanced Stereo Output Processor,
>>>>>> it looks really useful, i would really like to have one.
>>>>>> 
>>>>>> But i would really love to have it somehow patchable as a
>>>>>> Quad Output Processor if possible. It could still be used
>>>>>> as a stereo out if this is preferred. I don't know exactly
>>>>>> what it would take to convert your design into this without
>>>>>> changing it too much though...
>>>>>> 
>>>>>> /Johan
>>>>>> 
>>>> 
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>> ~~~~~~~~~~
>>>>>> Johan Boberg                              
>>>> http://www.eam.se
>>>>>> 
>>>>>> 
>>>>>> 
>>>>> <image.tiff>
>>>>>> 
>>>>>> 
>>>>> <image.tiff>
>>>>>> 
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