Adjust EQ settings by drawing EQ curves by hand on a touchpad

 Currently, many mixing boards work like this:

You manually select some frequencies, then adjust the filters at said frequencies (shelf, notch, dynamic EQing, bell, whatever...). This can be tedious.

To speed things up, if you know more or less how your instrument / mic / ... behaves and what you would like to do, it could be useful to use a pen and a touchpad as input devices, and set a new EQ curve by simply d r a w i n g the entire graph at once. For a bell curve or a shelf, the exact position matters less than for a notch filter. Still, it should be possible to draw a notch filter by hand and finetune the frequency of the absolute minimum later. Since there may be at least 4-ish annoying frequencies you need to take care of, if you know the behaviour of your gear, this could save some time.