Mastermind power at a more affordable price!

For years now, our Mastermind GT MIDI foot controller has set the standard for professional MIDI foot controllers, and it’s being used by musicians around the world.

The Mastermind LT MIDI foot controller has all of the MIDI capabilities and vast configurability of the Mastermind GT in a smaller, lower priced product. It’s the most flexible low cost MIDI controller available, and can do more than many of the higher priced controllers on the market!

The Mastermind LT’s small size makes it ideal for inclusion on pedalboards – use it to control your Strymon and Eventide pedals, for example. Or, use it as a controller for your music software – the Mastermind LT plugs directly into a PC or Mac’s USB port and will appear as a MIDI device in all of your MIDI capable apps.


  • 7 buttons, each with a multi-color LED. Buttons are completely user configurable for color and function
  • 16 button pages that can be set up to perform different functions, control multiple devices, etc.
  • A large main LCD display shows the preset number, preset name and/or song name
  • Phantom power capability allows you to run the Mastermind LT with a single MIDI cable – no separate power supply needed
  • More than one Mastermind LT can be connected together and used in multiple locations on stage
  • Expression pedal input which allows sending of continuous control MIDI messages to your effect devices
  • External switch input allows you to add an additional 1 or 2 buttons to the controller for tap tempo or any other purpose. External switches have a single color LED and can be configured to do anything that the internal switches can
  • Function switch output allows you to control channel switching on amps, 1/4-inch switching inputs on pedals, etc. Two switches are provided using a 1/4-inch TRS jack
  • USB support for direct connection to a PC or Mac. The Mastermind LT can be bus powered from the USB port
  • USB thumb drive input allows you to save and restore settings to a thumb drive
  • On board editing menus allow basic configuration for devices, MIDI CC, PC and Note messages
  • Editor software for PC and Mac allows additional configuration, including complete control over the configuration of buttons
  • 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)
  • Accepts one expression pedal using a TRS jack, high or low impedance
  • External switch input: 1 TRS jack for a total of 2 switches. Momentary switches required
  • Function switch output: 1 TRS jack for a total of 2 switches. Electrically isolated
  • 7-pin DIN connectors for MIDI input and output
  • USB “A” connector for connection to a USB thumb drive
  • USB “B” connector for connection to a PC or Mac. (Bus power supported)
  • Phantom power received over MIDI jacks
  • Dimensions: 11.5 (W) x 5.0 (D) x 2.75 (H) inches / 29.2 x 12.7 x 7.0 cm
  • Weight: 1.9lb / 0.86kg
  • Power requirements: 9-12VDC @ 150mA, center positive or negative, 2.1mm ID / 5.5mm OD barrel connector





Mastermind LT Manual (English, version 4.0)

Firmware Updates

Firmware update version 4.0.7

Version 4.0 adds many new features including:

  • Function switches now have special settings panels in the Globals and Presets tab of the editor. This allows you to set a default state, on/off overrides for each preset, and can lock a switch to be on or off at all times. Additionally, a function switch can be set to independent, which means it can only be changed by IA button presses and will not change when you change presets.
  • Added support for Empress Echosystem, Reverb, Tremolo and Phaser
  • You can now define up to 128 expression pedal settings blocks. There’s a System / ExpPedal action that allows you to switch expression pedal settings on the fly. This replaces expression pedal grouping
  • Each preset can be assigned an alternate preset number. There’s a new “Alternate” setting for the “Preset 2nd Press” global setting – when this setting is active, pressing a preset button a second time will recall the preset’s alternate preset.
  • You can now format flash drives from the setup menu
  • MIDI Forwarding setting allows you to use the Mastermind as a USB MIDI interface for other MIDI devices. Works well with Strymon pedals and the Nixie software on a PC or Mac.

Please see the RJM Forum for the complete list.

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 PBC while holding the 1 and 3 buttons. Keep holding until you see “PBC Bootloader” appear on the screen. Now plug the flash drive into your Mastermind PBC. The update should begin and will take a few minutes to complete.

Older Versions

Version 3.1.10: Firmware / Manual

Mastermind LT Editor

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

A manual for the Mastermind Editor is now available to view online

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

Mastermind Editor version numbers are synchronized with the firmware versions. If you’re running firmware 3.1.x, use editor version 3.1.x. (the last digit doesn’t matter)

Version 4.0.7: Mac OS X / Windows

Version 3.1.7: Mac OS X / Windows