Johnson Amplification Marquis JM120, User Manual

British  -

The British Amp models include Class A Clean based on a Vox AC30 (clean gain), Class A Dirty based on a Vox AC30 (dirty gain),

High Wattage based on a High Watt S50LC, Master Volume based on a Marshall Master Volume, Modern Gain based on a Marshall JCM900,
and Hot Rod based on a modified Marshall Master Volume.

Johnson -

The Johnson Amp models include Clean Tube (a clean combo setting), Crunch Tube (a smoothly overdriven combo), Saturated

Tube (an extra gain and sustain combo), Fuzz (a high gain fuzz distortion), Overdrive (a smooth crunch distortion), and Metal (a high gain
solid state distortion). 

Marshall® is a registered trademark of Marshall Amplification Plc.  Vox® is a registered trademark of Korg UK.  Fender, Matchless,
Soldano, Mesa Boogie, and Hiwatt are trademarks of their respective companies and are in no way associated with Johnson
Amplification.

Editing an Amp Model

Once you have selected the amplifier model that you intend to use, you can edit the gain and tonal characteristics of that amp, as well as
assigning a volume level (Level knob) for the preset. This is done through the use of the amp knobs (5 on the JM60, 6 on the JM120)
located under the amp modeling groups. 

Amp Controls

The amp control section consists of  a Gain, Treble, Mid, Bass, Presence (JM120 only) and Level knob. These knobs adjust the amp models
Gain, EQ, and Level. Each amp model has a default knob setting when it is selected. When you first select an amp model, the knobs will not
necessarily reflect the current values associated with the sound you are hearing. In other words, the amp does not “look” at the current
setting of the knob when an amp model is first selected. Once a knob is turned at least one whole number, the amp will update  the sound to
reflect that knobs current position for the sound you hear. The following is a description of each knobs function.

Gain -

This knob controls the amount of distortion gain (drive) for each preset.

Treble -

This knob is used to increase, or decrease the amount of high frequency enhancement in each preset.

Mid  -

This knob is used to increase, or decrease the amount of mid-range enhancement in each prese                                                

Bass -

This knob is used to increase, or decrease the amount of low frequency enhancement in each preset.

Presence (JM120 only) -

This knob is used to increase, or decrease the amount of definition or edge in each preset.

Level  -

This knob is used to adjust the volume level of each preset. This adjustment differs from the Master Volume in as much as the   

master volume will increase, or decrease all presets. The level knob will only increase or decrease the volume of its associated pre
set.

Noise Gate

The JM60/JM120 include a noise gate with an adjustable threshold. A noise gate is used to eliminate hum and noise while you are not
playing. The Noise Gate threshold is the only parameter available for adjustment. The Threshold is basically the strength, or volume level at
which the gate will open or close. When your signal exceeds the threshold, the gate will open allowing sound to be heard. When your signal
falls below the threshold, the gate closes allowing nothing to come through. The ideal setting for the threshold is to have it open as soon as
you strike a string, and close when you stop playing. 

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Section 2- Using the Marquis JM60/JM120