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Can someone explain it for me?

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.

Hmm, what do you mean with that "The smoothening uses some extra DSP (probably a simple feedback circuit)". How a feedback cause filtering?

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.

hehe, every iir filter is based on a feedback loop

Thanks guys