a simple example is...
You have resonant 303 type noise using a LPF burbling away and you want to then add a HPF to get rid of the bass.
or
A pad sound uses an phaser like lfo to band pass filter with a low pass filter cutting out overall brightness
Also if you use 2 of the same type of filters together you create a sharper cut off and res.
and lastly
You create a sound with 2 different filter settings and use the filter balance to morph between them.
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