Soundtoys Crystallizer - Manual (Page 28)

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High Cut
The High Cut knob controls a 12db per octave lowpass filter and allows you to reduce
the high frequencies of the effect signal based on the frequency setting of the knob.
The range of the knob is from 20 kiloHertz at the highest setting and to 500 Hertz
at the lowest setting. So as you turn the knob down or counter clockwise the
frequency decreases and more of the high end of the effect signal will be eliminated.
Using the Low and High Cut filters together allows you to create various types of
band pass filters. Keep in mind that these only affect the effected signal.