Hi Florian,

It is very interesting how much you learn about sound processing with a modular system.
You are right, in real compressor you don't have an envelope generator. Your slew limiter solution comes a real compressor more closer. I used an ADSR because I would get very well defined volume attenuation characteristics.

Have you thought about how to realize the ratio/limiting behavior How do you like the sound of your compressor

Ollie

--- In Doepfer_a100@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hi Ollie
>
> This may be an interesting effect, but it is not a compressor.
>
>
> The attack and delaytimes are a direct "portamento" on the envelope
> voltage of the original signal. They are NOT attacktimes of a separate
> envelope circuit. You may find a suggestion here:
> http://fa.utfs.org/diy/a100/A100_compressor.jpg
>
>
> The signals envelope voltage is inverted in the A175 (then fed through
> the VCS A159 which I will neglect at the moment(*)), then the A170 slew
> limiter adds the slew rate on the fast changing original envelope, which
> controls the VCA.
>
>
> Florian
>
> (*)The VCS decides, with the threshold of the gate out when the signals
> envelope voltage starts to become valid - also this is not what a real
> compressor is working like).
>