Get your pedalboard under control!

The Mastermind PBC is our first switching unit designed for use on a pedalboard. This product combines best of all of the products we’ve done over the years into one compact and powerful unit. This gives for the first time, the power and flexibility of a rack switching system – on a pedalboard!

We’ve designed the Mastermind PBC to get the most out of pedalboards that include MIDI controllable pedals like those made by Eventide, Line 6 and Strymon. Not only does the PBC handle all of the audio routing and switching, but also its comprehensive MIDI features allow complete control over these pedals.

With the Mastermind PBC, you get:

  • 10 audio loops, 4 of which are stereo capable and series/parallel switchable
  • Flexible outputs that can be configured as a stereo pair or as A/B outputs for switching between two amps
  • 4 function switches for amplifier channel control
  • Internal line mixer for parallel effect configuration
  • An integrated tuner
  • A full-featured MIDI controller that can send any type of MIDI message

All in one product!


  • 10 audio loops, arranged in a group of 4 loops, a group of 2 loops and another group of 4 loops, with insert points in between
  • True-bypass switching – the best for preserving your guitar’s tone!
  • The last four loops are stereo capable using TRS jacks
  • Each of the last four loops can be switched between series and parallel routing, using an internal line mixer
  • The two outputs can be used as left and right outputs for a stereo signal, or as A and B outputs to A/B switch a mono signal between two amps
  • The B output has a switchable isolation transformer and a programmable phase switch
  • Three audio buffers, each of which can be enabled or disabled by IA button or as part of a preset (before loop 1, before loop 7 and after loop 10)
  • Click Stopper noise reduction circuit, which can be switched between two positions (before loop 7 or after loop 10)
  • 11 buttons, each with a multi-color LED indicator
  • Buttons are user configurable – any button can be set to any function and LED color
  • Easy to read backlit LCD display that can display preset and song names, plus other status
  • Built in tuner
  • MIDI input & output connections, powered by the MIDI “brain” of our Mastermind GT controller
  • USB device port for connection to a PC or Mac. This allows the Mastermind PBC to send MIDI commands to a computer, or to communicate with the Mastermind PBC editor software.
  • USB host port for use with a USB thumb drive. Back up and restore settings to a flash drive, and also use a flash drive to perform firmware upgrades
  • Two 1/4-inch TRS jacks that provide four function switches. These can be used to control the channel switching and other features on an amplifier
  • Expression pedal input that can be programmed to generate MIDI messages
  • External switch input allows two more switches to be added. These switches can be programmed to perform any function
  • Mac and PC editor software allows for faster and more comprehensive editing, including deep MIDI editing and changing button layouts.
  • 3 year limited warranty


  • Size: 17.5″ (w) x 5.5″ (d) x 3.33″ (h) / 44.5 cm (w) x 14.0 cm (d) x 8.38 (h)
  • Weight: 4 lbs / 1.8 kg
  • 768 presets
  • 250 songs, 16 setlists
  • Can control up to 16 MIDI devices
  • 20 MIDI messages can be assigned per button (PC, CC, Note, Sysex)
  • Power requirements: 9VDC 500mA or 12VDC 400mA, Can be powered with Voodoo Lab power supplies that have a 12VDC 400mA output.




Supported Amplifiers

Most amps that have one to four 1/4-inch footswitch or external switching jacks are compatible with the Mastermind PBC. The exception to this is any amp that has a footswitch that has one 1/4-inch plug but more than two buttons. These footswitches use proprietary electronics and are not compatible with the Mastermind PBC.

Compatible Amps (partial list)

  • Friedman Amps (all models)
  • Marshall DSL
  • Mesa Lonestar
  • Mesa Mark II and III
  • Mesa Mark IV and V (partial functionality – use a Mini Amp Gizmo for better results)
  • Mesa Mark V 25
  • Mesa Mini Rectifier
  • Mesa Rectoverb 25
  • Mesa Dual and Triple Rectifier (partial functionality – use a Mini Amp Gizmo for better results)
  • Orange Amps (all models)
  • Peavey 5150 and 6505
  • Splawn (all models)
  • and many, many more (please contact us if you have questions!)

Incompatible Amps

  • Fender Hot Rod series (supported using Mini Amp Gizmo)
  • Fender Super-Sonic
  • Fender Twin w/ 4 button footswitch
  • Marshall YJM
  • Marshall Haze
  • Marshall MG series w/ “Stompware” footswitch

NOTE! We’re now offering special Mastermind PBC cables for a select few amps that were not able to be supported in the past. You can find these cables in our web store



Mastermind PBC Manual (English, version 4.0)

Firmware Updates

Firmware update version 4.0.7

Version 4.0 adds many new features including:

  • Audio loops can now be set as “independent”. This is a global-level setting that is a new option to the locked/unlocked setting. An independent loop does not change when you change presets – it stays in whatever state you last set (by IA button presses).
  • There is a new Guitar mode for the tuner that allows you to set a capo (in semitones) and per-string offsets (in cents). You can also use the Chromatic mode to get the old tuner behavior.
  • Added support for Boss MD-500 and RV-500
  • 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

Version 3.0.1: Firmware / Manual

Version 2.1.4: Firmware / Manual

Version 2.0.2: Firmware / Manual

Version 1.0.5: Firmware / Manual

Mastermind PBC Editor

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

A manual for the Mastermind PBC 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 1.0.x, use editor version 1.0.x. (the last digit doesn’t matter)

Version 4.0.7: Mac OS X / Windows

Version 3.1.7: Mac OS X / Windows

Version 3.0.1: Mac OS X / Windows

Version 2.1.3: Mac OS X / Windows

Version 2.0.1: Mac OS X / Windows

Version 1.0.5: Mac OS X / Windows