Doepfer

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).
>