Johnson Amplification Marquis JM120, User Manual

Chorus

A chorus is an effect that splits the incoming signal, and adds a short delay to one half of the signal. This short delay time (determined by the
depth control) is then “modulated”, which is to say that it speeds up and slows down the delay. The changing delay time takes the delayed
signal in and out of tune with the original signal. This tends to make the guitar sound thicker and sweeter.

Speed -

The speed knob will adjust how fast the chorus will modulate.

Depth -

The depth knob will adjust the intensity of the chorus effect.

Flanger

A flanger is an effect that splits the incoming signal, and adds a short delay to one half of the signal. This short delay time then speeds up and
slows down at a steady, even pace. The difference between a chorus and a flanger is that a flanger uses a shorter delay time than a chorus,
and a flanger adds several repeats to this short delay time. This gives the guitar a defined up and down sweeping, or whooshing sound.

Speed -

The speed knob will adjust how fast the flanger will sweep up and down.

Depth -

The depth knob will adjust the overall intensity of the flanger effect.

Phaser

A phaser is an effect that splits the incoming signal, and then changes the phasing of one the signals. This signal is then modulated in and
out of phase and mixed back in with the original signal. This causes certain frequencies to be cancelled. As the phasing changes, different
frequencies get canceled resulting in a warm sort of twisting sound.

Speed -

The speed knob adjusts how fast the phase is being changed.

Depth -

The depth knob adjusts the intensity of the phasing effect.

Tremolo

A tremolo is an effect that modulates the volume of the incoming signal at a steady, even pace. The incoming signal will go back and forth,
getting louder and softer. It would be kind of like having a motor on your guitars volume knob which increased and decreased the volume at
an even rate. Tremolo Level is not available on the JM60.

Speed -

The speed knob adjusts how fast the volume will fluctuate.

Depth -

The depth knob will adjust the intensity of the volume fluctuation

Vibrato

A vibrato is an effect that modulates the frequency, or pitch of the entire incoming signal. This will take the whole signal slightly in and out of
tune at a steady pace. Vibrato Level is not available on the JM60.

Speed -

The speed knob adjusts how fast the signal is being modulated.

Depth -

The depth knob adjusts the amount of pitch change.

Pitch/Detune

Pitch shifting is an effect that will make a copy of your incoming signal, and then shift the pitch of the copy to a different note. This results in
harmony.  As you play one note the pitch shifter is simultaneously playing a note higher, or lower with you. It’s like having another guitarist
in the band. The detune is an effect that can be added to the shifted pitch to take it slightly out of tune to make it sound more as if it were
really two guitarists, similar to a chorus type effect.

Speed -

The speed knob adjusts the interval of the pitch shifter. It will determine how far above or below the input note 

the shifted pitch will be.

Depth -

The depth knob adjusts the amount of detune.

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Section 2 - Using the Marquis JM60/JM120