DigiTech RP255 - Manual (Page 8)

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About the RP255
Performance Mode
When you first apply power to the RP255, it powers up in Performance mode. Performance mode
provides access to all of the presets within the RP255 via the Up and Down Footswitches.
Knob 1 selects a tone from the Tone Library, Knob 2 selects an effect from the Effects Library,
Knob 3 adjusts the Effects Level, and Knob 4 adjusts the Master Level (volume).
Bypass Mode
The RP255 presets can be bypassed via a true analog bypass circuit for a clean, unprocessed guitar
signal. To bypass the RP255, press both Footswitches simultaneously. The Display reads Bypass
indicating the preset is bypassed. Press either Footswitch to exit Bypass and return the RP255
to the last preset used.
Tuner Mode
The Tuner in the RP255 allows you to quickly tune or check the tuning on your guitar. Enter
Tuner mode by pressing and holding both Footswitches simultaneously. The Display briefly
shows tuner indicating that you are in Tuner mode. To begin tuning, play a note on your guitar
(a harmonic at the 12th fret usually works best). The Display shows the note being played. The
Matrix LEDs indicate whether you are sharp or flat. The top 5 red LEDs indicate the note is sharp
and should be tuned down. The bottom 5 red LEDs indicate the note is flat and should be tuned
up. The center green LED indicates the note is in tune. The output is muted in Tuner mode. The
Expression Pedal controls the guitar volume while tuning. Exit tuner mode by pressing either
Footswitch.