digi-tech RP155 User manual

Modeling
Guitar Processor
Owner’s
Manual

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DECLARATION OF CONFORMITY
Manufacturer’s Name: DigiTech
Manufacturer’s Address: 8760 S. Sandy Parkway
Sandy, Utah 84070, USA
declares that the product:
Product name: RP155
Product option: all (requires Class II power adapter that conforms to the requirements of EN60065,
EN60742, or equivalent.)
conforms to the following Product Specifications:
Safety: IEC 60065 (7th ed. 2001)
EMC: EN 55013 (2001+A1)
EN 55020 (1998)
Supplementary Information: The product herewith complies with the requirements of the Low Voltage Directive
2006/95/EC and the EMC Directive 2004/108/EC.
Vice-President of Engineering
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
Date: January 02, 2009
European Contact: Your local DigiTech Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah 84070 USA
Ph: [phone]
Fax: [phone]

Table of Contents
Section One - Introduction
Getting Acquainted.......................................................... 1
Included Items .................................................................. 1
About the RP155 .............................................................2
Performance Mode ....................................................... 2
Bypass Mode .................................................................. 2
Tuner Mode..................................................................... 2
Tone Library Knob ........................................................ 4
Effects Library Knob..................................................... 4
Master Level Knob........................................................ 4
X-EditTM Editor/Librarian............................................. 4
Presets ............................................................................. 5
A Guided Tour of the RP155 ........................................ 6
Front Panel ..................................................................... 6
Rear Panel.....................................................................10
Getting Started...............................................................12
Making Connections......................................................12
Mono Operation - Amplifier ....................................12
Stereo Operation........................................................13
Applying Power ..............................................................15
Section Two - Editing Functions
Editing/Creating Presets ...............................................16
Storing/Copying a Preset..............................................18
Section Three - Models and Parameters
About the Models..........................................................19
Model Definitions ..........................................................20
Pickup ...............................................................................20
Wah...................................................................................20
Compressor ....................................................................21
Distortion ........................................................................22
Amplifier...........................................................................24
Cabinet.............................................................................25
EQ......................................................................................25
Noise Gate......................................................................26
Chorus/FX.......................................................................27
Chorus...........................................................................27
Flanger ...........................................................................28
Phaser ............................................................................28
Vibrato............................................................................29
Rotary Speaker............................................................29
Tremolo..........................................................................29
Panner.............................................................................30
Envelope Filter .............................................................30
Auto Ya™ ......................................................................30
Step Filter......................................................................31
DigiTech Whammy™..................................................31
Pitch Shift ......................................................................32
Detune...........................................................................32
Harmony Pitch Shifting ..............................................33
Delay .................................................................................34
Reverb ..............................................................................35

Section Four - Other Functions
Phrase Looper ................................................................36
Drum Machine................................................................37
Optional Passive Volume/
Continuous Control Pedal...........................................38
Factory Reset..................................................................38
Section Five - Appendix
Specifications...................................................................39
Tone LIbrary....................................................................41
Effects Library.................................................................42

Warranty
We at DigiTech®are very proud of our products and back up each one we sell with the following warranty:
1. The warranty registration card must be mailed within ten days after purchase date to validate this
warranty.
2. DigiTech warrants this product, when used solely within the U.S., to be free from defects in materials and
workmanship under normal use and service.
3. DigiTech liability under this warranty is limited to repairing or replacing defective materials that show
evidence of defect, provided the product is returned to DigiTech WITH RETURN AUTHORIZATION,
where all parts and labor will be covered up to a period of one year.A Return Authorization number may
be obtained from DigiTech by telephone.The company shall not be liable for any consequential damage as a
result of the product’s use in any circuit or assembly.
4. Proof-of-purchase is considered to be the burden of the consumer.
5. DigiTech reserves the right to make changes in design, or make additions to, or improvements upon this
product without incurring any obligation to install the same on products previously manufactured.
6. The consumer forfeits the benefits of this warranty if the product’s main assembly is opened and tampered
with by anyone other than a certified DigiTech technician or, if the product is used with AC voltages outside
of the range suggested by the manufacturer.
7. The foregoing is in lieu of all other warranties, expressed or implied, and DigiTech neither assumes nor
authorizes any person to assume any obligation or liability in connection with the sale of this product. In no
event shall DigiTech or its dealers be liable for special or consequential damages or from any delay in the
performance of this warranty due to causes beyond their control.
NOTE:The information contained in this manual is subject to change at any time without notification. Some
information contained in this manual may also be inaccurate due to undocumented changes in the product or
operating system since this version of the manual was completed.The information contained in this version of
the owner’s manual supersedes all previous versions.

1
Section 1 - Introduction
Getting Acquainted
Congratulations on your purchase of the RP155. You now have an incredibly advanced modeling
guitar processor that can keep up with your creative impulses and even increase them. Armed
with DigiTech®’s patented AudioDNA2®custom audio DSP chip, the RP155 gives you a huge
selection of tones and effects, right at your fingertips.When you easily dial up a tone or effect
from the Tone Library or the Effects Library, you’ll appreciate the accuracy in each model, and the
dynamic interaction in each tone. Add USB support for computer recording, a Phrase Looper
and a built-in drum machine and you have the RP155: the key to unlock your creative potential.
Included Items
Before you get started, please make sure that the following items have been included:
 •RP155
 •PS0913BPowerSupply
 •WarrantyCard
The utmost care was taken while your RP155 was being manufactured. Everything should be
included and in perfect working order. If anything is missing, contact the factory at once. Please
help us become acquainted with you and your needs by completing your warranty card or regis-
tering online at www.digitech.com. It is your safeguard should a problem arise with your RP155.
Disclaimer: DigiTech, Lexicon,Whammy,YaYa,AutoYa, and Johnson Amplification are trademarks of Harman International
Industries, Inc. Other product names modeled in this product are trademarks of their respective companies that do not
endorse and are not associated or affiliated with DigiTech or Harman International Industries, Inc.They are trademarks of
other manufacturers and were used merely to identify products whose sounds were reviewed in the creation of this product.

2
About the RP155
Performance Mode
When you first apply power to the RP155, it powers up in Performance mode. Performance mode
provides access to all of the presets within the RP155 via the Up and Down Footswitches.
Knob 1 selects a tone from the Tone Library, Knob 2 selects an effect combination from the Ef-
fects Library, Knob3 adjusts the Effects Level, and Knob 4 adjusts the Master Level (volume).
Bypass Mode
The RP155 presets can be bypassed via a true analog bypass circuit for a clean, unprocessed guitar
signal. To bypass the RP155, press both Footswitches simultaneously. The Display reads 
indicating the preset is bypassed. Press either Footswitch to exit Bypass and return the RP155
to the last preset used.
Tuner Mode
The Tuner in the RP155 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 
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 indi-
cate 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. Exit tuner mode by
pressing either Footswitch.

3
Display shows
note played
Top LEDs indicate
note is sharp
Green LED indicates
note is in tune
Bottom LEDs indicate
note is flat
In Tuner mode, you can change your tuning reference. The default factory setting is A=440 Hz
(displayed as ). Rotating Knob 1 selects alternate and dropped tunings. Alternate tunings are
A=453Hz to A=427 Hz (displayed as  to ). Dropped tunings are A=A flat (displayed as ),
A=G (displayed as ), and A=G flat (displayed as ). The display window will briefly flash the cur-
rently selected tuning preference.
Exit Tuner mode by pressing either Footswitch.

4
Tone Library Knob
In Performance mode, this knob selects a variety of genre-based amp tone defaults ranging from
Blues to Metal to Country. Behind the scenes, the Compressor, Distortion, Amp/Cabinet model,
and EQ are configured to create a specified tone with a single click of this knob. You can further
refine the sound by editing the preset (see Editing/Creating Presets on page 16). Changing between
different Tone Library defaults does not change the Chorus/FX, Delay or Reverb, letting you ex-
periment with different amp styles quickly in the context of the current effect chain.
Effects Library Knob
In Performance mode, this knob selects a variety of post-amplifier model effect chains (Chorus,
Chorus + Delay, Delay + Reverb, etc.).You can further refine the sound by editing the preset (see
Editing/Creating Presets on page 16). Changing between different Effects Library defaults does not
change the Compressor, Distortion, Amp/Cabinet model, and EQ settings, letting you experiment
with different effect chains quickly in the context of the current amp tone.
Effects Level Knob
In Performance mode, this knob changes the relative level of the post-amp effects (Chorus/FX,
Delay, and Reverb). This can be thought of as an effects mix control, where turning this knob
clockwise increases the level of these effects and turning it counter-clockwise decreases the level
of these effects.
Master Level Knob
This knob controls the overall output volume of all of the RP155’s presets.
X-EditTM Editor/Librarian
You can edit your RP155 with your computer, using the X-EditTM Editor/Librarian. Download
X-EditTM, USB drivers, and documentation from www.digitech.com.

5
Presets
Presets are named and numbered locations of programmed sounds which reside in the RP155.
Presets are recalled with the Footswitches. The active effects in each preset are indicated by
lighted LEDs in the Effect Matrix. The RP155 comes with 50 User presets (1-50) and 50 Factory
presets (51-00). The User presets are locations where your creations may be stored. The Factory
presets do not allow you to store any changes to them. From the factory, the 50 User presets are
exact duplicates of the 50 Factory presets. This allows you to create your own presets without
losing the sounds that came with the RP155.
The Tone Library knob, Effects Library knob, and Effects Level knob make it easy to
quickly load preset tones, effects, and effects chains.
1. Select a tone
with the
Tone Library knob
2. Select an effect
or effects chain with the
Effects Library knob
3. Adjust the
effects level with the
Effects Level knob
To learn about storing changes to presets, see page 18.

6
A Guided Tour of the RP155
Front Panel
1
2
3
4
56
7

7
1. Footswitches
These two Footswitches are used to select presets, access the Tuner, enable the Phrase Looper,
and Bypass the RP155. The Footswitch on the right will select the next preset up, and the
Footswitch on the left will select the next preset down. Pressing both Footswitches together
will bypass the currently selected preset. Pressing and holding the Left Footswitch will enable and
disable the Phrase Looper. Pressing and holding both Footswitches for 2 seconds will access the
Tuner. Press either Footswitch to exit Bypass or Tuner mode.
2. Knobs 1-4
These four knobs perform various functions, depending on which mode is currently active and
what (if anything) is being edited. The functions are listed below:
Tone Library Knob (Knob 1)
1. In Performance mode, this knob selects from a library of pre-programmed amp tones.
(See page 41 for a list of preset amp tones.)
2. When editing a preset, this knob changes the Amp or Effect model for the selected row.
3. When editing an Effect row, press this knob to turn on or bypass the effect.
4. When the Drums row is selected, this knob selects the first pattern of each
style (Rock, Blues, Jazz, etc.).
Effects Library Knob (Knob 2)
1. In Performance mode, this knob selects from a library of pre-programmed effect
configurations. (See page 42 for a list of preset effect configurations.)
2. When editing a preset, this knob modifies the parameter listed in the column
directly above it for the selected Effect row.
3. When the Drums row is selected, this knob selects the different drum patterns available.

8
EffectsLevelKnob(Knob3)
1. In Performance mode, this knob adjusts the overall level of post amp model effects (Cho-
rus/Mod, Delay, and Reverb).
2. When editing a preset, this knob modifies the parameter listed in the column directly
above it for the selected Effect row.
3. When the Drums row is selected, this knob adjusts the playback Tempo of the drum
machine.
Master Volume Knob (Knob 4)
1. In Performance mode, this knob adjusts the output level of the RP155.
2. When editing a preset, this knob modifies the parameter listed in the column directly
above it for the selected Effect row.
3. When the Drums row is selected, this knob adjusts the drum machine playback level.
3. Edit buttons
These buttons navigate up and down the matrix, selecting the row of parameters which the
knobs will edit. Press one of these buttons to step through the Effect rows, and return to the
preset name display. See page 16 for more information about editing presets.
4. Matrix
The matrix provides information regarding the current preset and parameter edit functions. In
Performance mode, the LEDs running down the left side of the Matrix provide a visual indication
of which effects are in use for the currently selected preset. While editing a preset, the LEDs
indicate the Effect row currently selected for editing. In Tuner mode, the LEDs indicate whether
the note played is sharp, flat, or in tune.

9
5. Display
The Display provides information for different functions depending on the mode that has been
selected. In Performance mode, the Display will show the currently selected preset number. In
Edit mode, the Display will show the value of the parameter being adjusted. In Tuner mode, the
Display will show the note played.
6. Drums
The Drums button is used to turn on and off the RP155’s built-in drum machine. When the
Drums button is turned on, the Drums button LED lights and the selected drum pattern plays
continuously. Select the Drums row using the Edit buttons and use Knobs 1-4 to change the
style, pattern, tempo, and level of the drum machine. See page 37 for more information about the
drum machine and a list of patterns.
Note: The RP155’s Drum Machine is not available when the Phrase Looper is active.
7. Store
The Store button is used to save your custom edits to the user presets. See page 18 for more
information about storing presets.

10
Rear Panel
1 2 3 4 5 6 7
1. Input
Connect your instrument to this high-impedance TS input.
2. Amp / Mixer
This button optimizes the RP155’s outputs for use when plugged into a guitar amp or a mixer/
recording device. When set to Mixer (“In” position), the outputs are optimized for connecting
to a mixer, recording device or headphones. When set to Amp (“Out” position), the outputs are
optimized for running directly in to the input of a guitar amp.
3. Left (Mono) and Right Outputs
Connect the Left (Mono) output to the input of a single amplifier (or mixer input) for mono
operation. Connect the Left and Right outputs to the inputs of 2 amplifiers (or 2 mixer channels)
for stereo operation.

11
4. Headphones
Connect a pair of stereo headphones to this 1/8" jack. For proper frequency response, the Amp/
Mixer switch should be set to Mixer (“in” position) when using headphones. Headphones with an
impedence of 100 Ohms or less are recommended.
Note: The Headphones output can have either a mono or stereo signal, depending on what 1/4"
outputs are connected. If neither (or both) 1/4" outputs are connected, the Headphones output
will be in stereo. If a cable is connected to the Left (Mono) 1/4" output only, the Headphones
output will be in mono.
5. Control In
You can connect a passive volume or continuous control pedal to this 1/4" jack to control the a
Wah and/or the WhammyTM when either or both of those effects are turned on.When neither
Wah nor Whammy is turned on, the pedal controls the RP155’s volume by default.
6. USB Jack
The USB jack connects the RP155 to a computer and provides two purposes. First it is used to
provide communication between the RP155 and the X-Edit™ Editor/Librarian software. Second, it
is used to stream four channels of audio (2 up / 2 back) to and from the computer when using the
RP155 to record via any DAW recording application. Knobs 2 and 3also control the direct/play-
back mix and USB record level when USB is connected and the Pickup Row is selected.
Note: You can download the X-Edit Editor/Librarian software and USB drivers at www.digitech.com.
7. Power Input
Connect only the DigiTech®PS0913B power supply to this jack.

12
Getting Started
Making Connections
There are several different connection options available with the RP155. Before connecting the
RP155, make sure that the power to your amplifier and the RP155 is turned off. There is no
power switch on the RP155. To turn the RP155 on or off, connect or disconnect the included
PS0913B power supply from the Power Input jack.
Mono Operation - Amplifier
Connect your guitar to the Input of the RP155. Connect a single mono instrument cable from
the Left (Mono) output of the RP155 to the instrument input or effect return on your amplifier.
Set the Amp/Mixer switch to Amp.
Guitar Amp Input/Effect Return
Left (Mono)
Output Input
Amp/Mixer
switch set to
Amp.
NOTE: When using a
guitar amp, it may be best to
connect the Output of the
RP155 to the effect return
of the amplifier.

13
Stereo Operation
For stereo operation connect the guitar to the Input of the RP155. Connect one cable to the
RP155’s Left (Mono) output, and another cable to the RP155’s Right output. Connect one cable
to the input of one amplifier, channel of a mixer, or power amp. Connect the second cable to a
second amplifier, second channel of a mixer, or power amp. If connecting to a mixing console, set
the pan controls of the mixer channels hard left and right in order to retain stereo separation. If
connecting to a mixer, set the Amp/Mixer switch to Mixer. If connecting to two amplifiers, set
the Amp/Mixer switch to Amp.
Stereo Amp Setup
Guitar Amp Input/Effect Returns
Outputs Input
Amp/Mixer
switch set to
Amp.
NOTE: When using a guitar amp,
it may be best to connect the
Output of the RP155 to the effect
return of the amplifier.

14
Stereo Mixer Setup
Computer Recording Setup
Outputs
Instrument Input
Powered
Studio Monitor
Powered
Studio Monitor
USB
Amp/Mixer switch
set to Mixer
Outputs
Instrument Input
1 2 3 4 5 6
Mixer
Amp/Mixer switch
set to Mixer