Fender Mustang GT40

Fender Mustang GT40 GT100 GT200 User Manual CONTROL PANEL

Fender Mustang GT40

The Mustang GT top control panel consists of an instrument input, control knobs (seven on the Mustang GT100 and GT200; five on the Mustang GT40), a display window, three LAYER pushbuttons, an ENCODER wheel, four UTILITY pushbuttons, an auxiliary input (1/8”) and a headphone output (1/8”).

  • A. INPUT: Plug instrument in here.

  • B. GAIN: Programmable control knob (see page 3) that affects gain setting in each preset.

  • C. VOLUME: Programmable control knob that affects amp model volume setting in each preset.

  • D. TREBLE: Programmable control knob that affects treble tone setting in each preset.

  • E. MIDDLE (Mustang GT100 and GT200 only): Programmable control knob that affects midrange tone setting in each preset.

  • F. BASS: Programmable control knob that affects bass tone setting in each preset.

  • G. REVERB (Mustang GT100 and GT200 only): Programmable control knob that affects reverb setting in each preset.

  • H. MASTER VOLUME: The only non-programmable knob; controls actual overall volume.

  • I. DISPLAY WINDOW: Shows preset in use and all its contents and parameters, amplifier and effects menus, and other functions (i.e., tuner, menu functions, etc.).


    • PRESET LAYER: Highlights preset layer, where presets are chosen.

    • SIGNAL PATH LAYER: Highlights signal path in each preset, where amp models, effects types and order of effects can be modified.

    • CONTROLS LAYER: Highlights controls layer, where control knob settings can be modified (except Master Volume).

  • K. ENCODER: Multipurpose rotary control with press-switch function. For viewing, selecting and adjusting Mustang GT presets, controls and other functions.


    • X FX: Bypasses all effects.

    • SAVE: For saving preset modifications and new presets.

    • MENU: For accessing WiFi, Bluetooth, Tuner, Global EQ, cloud presets and other functions (see page 28).

    • TAP: For setting delay times and modulation rate settings; hold to access built-in tuner.

  • M. AUXILIARY INPUT, HEADPHONE OUTPUT: 1/8” auxiliary input for connecting external audio devices, and 1/8” output for headphone use. Headphone output disables internal speaker(s).

It’s important to note that all top control panel knobs except Master Volume (H) are, as described above, “programmable.”That means that when a preset is first selected, the physical position of a top control panel knob may not indicate the actual setting contained in that preset (the actual setting appears in the display window). Only the Master Volume control is not programmable—its physical position always indicates actual overall volume. Once a programmable top control panel knob is turned, however, it and its digital counterpart within a preset become synchronized to the same value, as illustrated here:

Also note that an adjusted control knob setting can be saved in a new preset, or the original preset can be overridden with the adjusted control knob setting. If the adjusted setting is not saved, the preset will revert to its pre-programmed control knob settings when returning to the preset after leaving it, or when turning the amplifier off and back on again (see further info under “Editing and Saving Presets” pages 5-6).

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