DigiTech Whammy DT Owner's Manual page 11

Detune Effects
This group of effects creates a copy of your input signal, shifts the pitch of the copied signal and
mixes it back with the original signal. As the Expression Pedal is rocked back and forth, the amount
of this detuned signal is changed. With the pedal in the toe up position, only the original dry signal
is heard. As the pedal is rocked forward, the detuned signal is mixed with the dry signal. This effect
can be used in combination with the Drop Tune effect. The Detune effects include:
SHALLOW – The copied signal is slightly detuned from the original pitch.
DEEP – The copied signal is substantially detuned from the original pitch.
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