[sdiy] How does the JX3P VCA work?

[Dan Snazelle]

> On Jan 15, 2014, at 9:23 AM, "Mattias Rickardsson" <mr at analogue.org> wrote:
> 
> Maybe not necessary, but perhaps they could omit one trimpot per
> voice, if the same color marking was used throughout?
> 
> Anyway, if you're Roland and you already have thousands of measured
> trannies in bins, you could as well grab a full hand from the same bin
> when making a machine. It's even easier than mixing them. :-)
> 
> /mr
> 

interesting thread

id always wondered if that VCA might be any good....i sort of hoped it would be!


ive never played a jx3p 
oh well





>> On 15 January 2014 14:41, Florian Anwander <fanwander at mnet-online.de> wrote:
>> Am 15.01.2014 14:09, schrieb Neil Johnson:
>> 
>>>>> it doesn't make sense to have all 6 VCAs made from the same match
>>>>> pattern
>>>> 
>>>> Unless you want all 6 voices to behave the same. ;-)
>>> 
>>> From these images it looks like all the transistors for a given
>>> function have the same colour spot:
>> 
>> I don't doubt, that Roland did handle it that way. My thought is more: was
>> it really necessary? These are quasi linear VCAs. Different characteristics
>> would have a lower impact than in an exponentiator. I don't doubt that there
>> would exist a difference, but I doubt one would hear(!) the difference, if
>> matched pairs with different HFEs would be used.
>> 
>> 
>> Florian
>> 
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