TC Electronic Stereo Chorus/Flanger & Pitch Modulator User Manual page 16

THE CONTROLS
In PITCH MODILATION mode, the INTENSITY control mixes
an increasing amount of pitchshift (vibration, following the
speed rate) over the chorus signal. If the control is turned fully
clockwise the chorus part of the signal is at minimum. The
effect is most pronounced at high speed settings, and
applicable to give e.g. a keyboard sound a "leslie-like"
character.
In FLANGER mode, INTENSITY controls the amount of signal
which is regenerated. More regeneration creates a "deeper"
more metallic sound.
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