DigiTech BRIAN MAY RED SPECIAL PEDAL Owner's Manual page 15

Using the Optional FS3X Footswitch
The optional FS3X footswitch gives you hands-free access to each of the
Red Special Pedal's different models quickly and seamlessly, and lets you
switch between heel and toe modes in each. The FS3X comes complete
with a 1/4" stereo TRS cable that connects it to the FOOTSWITCH
jack on the right side of the Red Special Pedal.
Once connected, operation is easy. Press the UP switch to change to the
next model up. Press and hold the UP switch for three seconds to select
Model 7. Press the DOWN switch to change to the next model down.
Press and hold the DOWN switch for three seconds to select Model 1.
Press the MODE switch to cycle through the Toe (Green) mode and the
Heel (Red) mode. (The model must be engaged or disengaged using the
TOE or HEEL switch on the pedal.)
FS3X Footswitch (Optional)
DOWN
Selects the next lower Model.
MODE Hold for three seconds to select
Toggles between Toe Mode MODEL 1.
(green LED) and Heel Mode
(red LED) when a Model
is active.
UP
Selects the next higher Model.
Hold for three seconds to select
MODEL 7.