MIDI Reception/Implementation
The MIDI receiver will respond to the following MIDI messages on a user selected MIDI Channel (saved in EEPROM) and
it will be capable of functioning properly even if Running Status is utilized by the MIDI transmitter.
(1) Program Changes 1 to 128 select presets 1 to 128, which are saved in EEPROM memory.
(2) Control Change #56 (w/Control Value 127 = on) allows for “Instant Access” selection of Channel 1.
Control Change #57 (w/Control Value 127 = on) allows for “Instant Access” selection of Channel 2.
Control Change #58 (w/Control Value 127 = on) allows for “Instant Access” selection of Channel 3.
Control Change #59 (w/Control Value 0 = off & 127 = on) allows for “Instant Access” of the FX Loop.
Control Change #60 (w/Control Value 0 = off & 127 = on) allows for “Instant Access” of the Graphic EQ.
Control Change #61 (w/Control Value 0 = off & 127 = on) allows for “Instant Access” of the Mute Output.
Randall V2 MIDI Pedal
Functional Details
On power-up all five LED’s will turn on and remain on for 2 seconds (to allow the end user to verify they are functioning
properly). After the 2 second LED test/delay, all the LED’s will turn off with the exception of the Channel 1 LED, and the
MIDI data associated with the Channel 1 switch will be transmitted via the MIDI output jack.
Pressing the FX Loop switch when the FX Loop LED is off will cause MIDI Control Change #59 with a Control Value of
#127 on MIDI Channel 1 to 16 (OMNI mode) to be transmitted via the MIDI output jack and the FX Loop LED will turn on.
Pressing the FX Loop switch when the FX Loop LED is on will cause MIDI Control Change #59 with a Control Value of
#000 on MIDI Channel 1 to 16 (OMNI mode) to be transmitted via the MIDI output jack and the FX Loop LED will turn off.
Pressing the Graphic EQ switch when the Graphic EQ LED is off will cause MIDI Control Change #60 with a Control
Value of #127 on MIDI Channel 1 to 16 (OMNI mode) to be transmitted via the MIDI output jack and the Graphic EQ LED
will turn on.
Pressing the Graphic EQ switch when the Graphic EQ LED is on will cause MIDI Control Change #60 with a Control
Value of #000 on MIDI Channel 1 to 16 (OMNI mode) to be transmitted via the MIDI output jack and the Graphic EQ LED
will turn off.
UPDATED 09/01/05 : The three channel switches will now function as channel/preset switches. They will still select the
appropriate amp channel; 1, 2 or 3, but they will also transmit MIDI data relating to the FX Loop and Graphic EQ on/off
status, which will be stored in EEPROM. As such, pressing the three channel switches will also affect the on/off status of
the LED’s for the FX Loop and Graphic EQ…
The default for a new pedal fresh off the assembly line will have the FX Loop and Graphic EQ stored in the off setting for
each of the three channel/preset switches…
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Pressing the Channel 1 switch will cause the following to be transmitted via the MIDI output jack;
MIDI Control Change #56 with a Control Value of #127 on MIDI Channel 1 (selects channel 1 on receiver)
MIDI Control Change #59 with a Control Value of #000 on MIDI Channel 1 (turns FX Loop off on receiver)
MIDI Control Change #60 with a Control Value of #000 on MIDI Channel 1 (turns Graphic EQ off on receiver)
The above three messages will be re-transmitted on MIDI Channel 2, then 3… all the way up to 16 (OMNI Mode)
The Channel 1 LED will turn on and the Channel 2, Channel 3, FX Loop and Grpahic EQ LED’s will turn off.
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Pressing the Channel 2 switch will cause the following to be transmitted via the MIDI output jack;
MIDI Control Change #57 with a Control Value of #127 on MIDI Channel 1 (selects channel 2 on receiver)
MIDI Control Change #59 with a Control Value of #000 on MIDI Channel 1 (turns FX Loop off on receiver)
MIDI Control Change #60 with a Control Value of #000 on MIDI Channel 1 (turns Graphic EQ off on receiver)
The above three messages will be re-transmitted on MIDI Channel 2, then 3… all the way up to 16 (OMNI Mode)
The Channel 2 LED will turn on and the Channel 1, Channel 3, FX Loop and Grpahic EQ LED’s will turn off.
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