what is "de-zip"?
It's like a lowpass filter on the control motion. It prevents clicks when for example setting volume from numpad, which will always introduce jumps. The smoothening uses some extra DSP (probably a simple feedback circuit), that's one of the reasons j9k's mini mixer uses less DSP.
more has been done with less
https://soundcloud.com/at0m-studio
https://soundcloud.com/at0m-studio
Reduced feedback makes a low pass filter or smoother because it takes the average of the new input and previous output from a signal. This smoothens peaks.
more has been done with less
https://soundcloud.com/at0m-studio
https://soundcloud.com/at0m-studio