Hallo!
It is a sort of multi-band-filter Every slider can put a 0 a group of frequencies. The cildren can cancel groups of frequencies or can listen isolate portions of sound spectrum (like with the eraser on a design).
I don't know if I understand you, but if you want to control different frequencies with sliders maybe a FFT-filter or bandpass filters are easier to use (okay, there are some problems and workarounds with them) ...
Not knowing as to call this kind of filter I have defined it EQ,
but I hope that you will apologize me, I am not a suond designaer :)
no need to apologize ... :)
LG Georg