The most advanced and versatile MIDI controller pedal ever created.

Now available in 10, 16 and 22 button configurations!

The Mastermind GT is the result of years of research and development, using modern technology to create what we believe is the best MIDI foot controller ever made. Our initial prototype shown at the Winter 2011 NAMM Show drew an unprecedented amount of attention from all over the music industry: guitarists, DJs, keyboardists, producers and more. We’ve made many improvements over that original prototype and are now ready to deliver it to market.

By adding a display over every button, we’ve made it possible to have a fully configurable MIDI controller. Any button can be assigned to any function, and colors and button text are fully configurable by the user. Buttons can send multiple MIDI messages of several types, and there can be up to 16 pages of buttons so you will always have access to all of the functions your rig has available.

Add in other features such as user upgradeable firmware, USB thumb drive support and built-in support for many popular MIDI devices, and you can see why there has been so much buzz about this product.


  • 10, 16 or 22 buttons, with an LCD display over every button. Any button can be set to perform any function (preset, IA, bank up/down, tap tempo, etc.) and the LCD will indicate what the button does. No more board tape!
  • A large main LCD display shows the preset number, preset name and/or song name
  • The 22 button version also has 6-pin XLR ports for connecting to our Rack Gizmo, Effect Gizmo and future RJM products
  • Phantom power capability allows you to run the Mastermind GT with a single MIDI cable – no separate power supply needed
  • More than one Mastermind GT can be connected together and used in multiple locations on stage
  • Jacks to connect four expression pedals and four external switches allow for lots of control over connected effects processors and other MIDI devices
  • Two auxilliary 9VDC power outlets for tuner, wah pedal, etc
  • USB support for direct connection to a PC or Mac
  • USB thumb drive input allows you to save and restore settings to a thumb drive
  • Editor software for PC and Mac
  • Advanced on-board editing capability which makes this controller very easy to program, even without using the editor software
  • Built for the rigors of the road with high quality components throughout
  • 3 year limited warranty
  • Made in the USA


  • Number of instant access buttons, preset buttons and bank size are all user definable – any button can be assigned to any function
  • 768 presets, 16 pages of buttons and 16 connected devices
  • Preset buttons can send a program change to all 16 devices with a single tap
  • In addition to sending program changes to each device, preset buttons can also send up to 10 other MIDI messages (any combination of CC, PC, Note or Sysex)
  • IA buttons can send up to 20 messages (any combination of CC, PC, Note or Sysex)
  • Expression pedal inputs: 4. Accepts expression pedals using TRS jacks, high or low impedance
  • External switches: 2 TRS jacks for a total of 4 switches. Momentary switches required.
  • 7-pin DIN connectors for MIDI input and output
  • 6-pin XLR connectors for MIDI connections to other RJM devices
    (Available on 22 button model only)
  • USB "A" connector for connection to a USB thumb drive
  • USB "B" connector for connection to a PC or Mac
  • Phantom power received over DIN and XLR MIDI output jacks
    (XLR jacks only available on 22 button model)
  • Accessory power outputs: 9VDC center negative, standard BOSS-style connector. 100mA total current for both jacks combined.

Mastermind GT/10

  • Dimensions: 19.4 (W) x 8.1 (D) x 3.25 (H) inches / 49.3 x 20.6 x 8.3 cm
  • Weight: 6lb / 2.7kg
  • Power requirements: 12VDC @ 700mA, center positive, 2.1mm ID / 5.5mm OD barrel connector

Mastermind GT/16

  • Dimensions: 19.4 (W) x 11.1 (D) x 3.25 (H) inches / 49.3 x 28.2 x 8.3 cm
  • Weight: 8lb / 3.6kg
  • Power requirements: 12VDC @ 1000mA, center positive, 2.1mm ID / 5.5mm OD barrel connector

Mastermind GT/22

  • Dimensions: 19.4 (W) x 14.1 (D) x 3.25 (H) inches / 49.3 x 35.8 x 8.3 cm
  • Weight: 10lb / 4.5kg
  • Power requirements: 12VDC @ 1500mA, center positive, 2.1mm ID / 5.5mm OD barrel connector





Mastermind GT Manual (English, version 3.4)

Firmware Updates

Firmware update version 3.4.9

Version 3.4 adds a Setlist action that allows you to change setlists with a button press. It also changes the way the number of banks and presets are specified for devices, which also fixes how the Device PC +/- buttons work with Strymon pedals.

Please see the RJM Forum for the full list of changes.

To update your firmware: First, back up your settings to a flash drive or computer! Download and unzip the above file. Copy the file to a USB flash drive, and remove any other .rjf files from the flash drive. Eject the drive from your computer. Power on the Mastermind GT while holding the two small buttons under the main screen. Keep holding until you see "MMGT Bootloader" appear on the screen. Now plug the flash drive into your Mastermind GT. The update should begin and will take a few minutes to complete.

Older Versions

Version 3.3.1: Firmware / Manual

Version 3.2.5: Firmware / Manual

Version 3.1.1: Firmware / Manual

Version 3.0.2: Firmware / Manual

Version 3.0: Firmware / Manual

Version 2.3.6: Firmware / Manual

Version 2.2.0: Firmware / Manual

Version 2.1.1: Firmware / Manual

Version 2.0.3: Firmware / Manual

Version 1.4.5: Firmware / Manual

Mastermind GT Editor

The Mastermind GT Editor is now available. You can download it for free, and you can evaluate it even if you don’t have a Mastermind GT.

A manual for the Mastermind GT editor is now available to view online

The Mastermind GT Editor runs on Mac OS 10.8 and above, and Windows 7 and above.

Mastermind GT Editor version numbers are synchronized with the firmware versions. If you’re running firmware 3.3.x, use editor version 3.3.x. (the last digit doesn’t matter)

Version 3.4.6: Mac OS X / Windows

Version 3.3.0: Mac OS X / Windows

Version 3.2.3: Mac OS X / Windows

Version 3.1.1: Mac OS X / Windows

Version 3.1.0: Mac OS X / Windows

Version 3.0.2: Mac OS X / Windows

Version 3.0: Mac OS X / Windows

Version 2.3.6: Mac OS X / Windows

Version 2.1.0: Mac OS X / Windows

Version 2.0.0: Mac OS X / Windows

Version 1.4.5: Mac OS X / Windows