User`s manual

25
External Switches
The Mastermind GT supports up to four external switches. These can be used to add switches to remote locations, to
add different types of switches for specialized functions like tap tempo, or simply to increase the number of available
switches.
There are two external switch jacks on the rear of the Mastermind GT labeled “Switch 1/2” and “Switch 3/4". Each jack
can take a single switch or a double switch with a TRS (tip-ring-sleeve) plug. A single switch should use a TRS plug with
the switch connected to the tip and ground, and the ring conductor unconnected to anything. External switches need
to be momentary and normally open. Latching switches will not work correctly. If an LED is wired in parallel with the
switch with the cathode connected to the shield of the TRS connector, the Mastermind GT will light the LED when the
switch is on.
RJM Music sells single and dual external switches made to work correctly with the Mastermind GT, and Mission
Engineering’s SP1-RJM expression pedal includes a toe switch (similar to the on/off switch on a wah pedal) with LED
that can work as an external switch for the Mastermind GT.
Setting the external switches works the same way as setting a button on the controller. You use the Edit Buttons
function to edit the button parameters, as described in the Editing Buttons section. Just press the external switch when
prompted to select a button. External switches can change from page to page just like a normal button, so please be
aware of which button page you’re on when editing external switches.