[sdiy] lin to log envelope

[gregory zifcak]

hello,

i saw in the archives a reference to changing the shape of envelopes by 
feeding them back into themselves either positively or negatively. does this 
refer to the positive and negative inputs of the opamp?

my application is this:
i have a simmons sds800 which uses cem3394 chips for osc-vcf-vca. according 
to the datasheet, the vcas are approximately exponential, allowing 
exponential volume shapes with a linear envelope. i am assuming that the 
simmons envelopes are linear or maybe even exponential, because they are not 
particularly punchy. i would like to make them logarithmic if possible in 
order to obtain punchy, linear dynamic response.

so basically my question comes down to where do i feed(back) the output of 
the envelope?

thanks for any info,

greg

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