Fender Rumble LT25 User manual

EXPANDED OWNER’S MANUAL
BASS AMPLIFIER

CONTENTS
Introduction 1
Control Panel 2
Presets Basics 3
Editing and Saving Presets 4
Accessing Preset Contents 4
Editing and Saving Amplier Control Settings 4
Changing the Amplier Model in a Preset 7
List of Rumble LT25 Amplier Models 8
Editing and Saving Eects Control Settings 9
Replacing, Adding and Deleting Eects 10
Setting Delay Times with the Tap Button 12
List of Rumble LT25 Eect Models 13
Menu Functions 14
Tuner 15
Footswitch 16
Settings 17
Restore 17
Auxiliary Input and Headphone Output 18
USB Port 18
Specications 19

INTRODUCTION
This expanded owner’s manual is a thorough user’s guide to the features and functions of the Rumble LT25
amplier.
As a complement to the Rumble LT25 Quick Start Guide that comes with each amplier, this manual pres-
ents a detailed look at the amp’s versatile features. This includes navigation and modication of the onboard
presets, and comprehensive descriptions of the amplier and eect models. It also includes illustrated step-
by-step instructions for using Rumble LT25’s onboard tuner, footswitch, USB port and other functions.
While this expanded manual presents the most current version of the amplier, also check back for updated
manual versions that will serve as even more helpful guides as Rumble LT25 and its capabilities evolve.
Be sure to check fender.com/rmware/support regularly for rmware updates that improve and enhance the
Rumble LT25 experience.
1

CONTROL PANEL
The Rumble LT25 top control panel consists of an INSTRUMENT INPUT, ve CONTROL KNOBS, a DISPLAY
WINDOW, an ENCODER wheel, four UTILITY pushbuttons, a FOOTSWITCH INPUT, an AUXILIARY INPUT (1/8”),
a HEADPHONE OUTPUT (1/8”), a TAP LIGHT and a USB PORT.
A. FOOTSWITCH (“FTSW”): Connect optional single-button footswitch here (page 16).
B. INPUT: Plug instrument in here.
C. AUXILIARY INPUT, HEADPHONE OUTPUT: 1/8” auxiliary input for connecting external audio devices,
and 1/8” output for headphone use (page 18). Headphone output disables speaker.
D. GAIN: Aects gain setting in each preset.
E. BASS: Aects bass tone setting in each preset.
F. MIDDLE: Aects midrange tone setting in each preset.
G. TREBLE: Aects treble tone setting in each preset.
H. MASTER VOLUME: Controls overall volume.
I. DISPLAY WINDOW: Shows preset in use, preset contents and parameters, and other functions (i.e., tuner
and other menu functions).
J. ENCODER: Rotary control with press-switch function. For viewing, selecting and adjusting Rumble LT25
presets, controls and other functions.
K. UTILITY BUTTONS
BACK: Returns user to the previous screen or original preset screen.
SAVE: For saving preset modications, renaming presets and saving presets to a new location.
MENU: For accessing tuner, footswitch and other functions (page 14).
TAP: For setting delay times (page 12) and accessing built-in tuner (page 15).
L. TAP LIGHT: Flashes in time with delay eects.
M. POWER: Turns amplier on and o.
N. USB PORT: Amp connection point for USB audio recording (page 18).
O. IEC POWER INLET (REAR PANEL; NOT SHOWN): Using the included power cord, connect to a grounded
outlet in accordance with the input power voltage and frequency specied at the power inlet.
2
GAIN BASS MIDDLE TREBLE MASTER

3
PRESET BASICS
Rumble LT25 features 30 sequentially numbered presets. Each preset consists of an amplier and one or
more eects (or, in some cases, no eects). Note that when turning the amplier on, the default active preset
is always factory preset 01. Further, 20 additional presets are available when using the“REPLACE”feature
(page 7).
To scroll through presets, turn the ENCODER; whichever preset is displayed becomes active:
Rumble LT25’s 30 original factory presets are:
01 STUDIO CLEAN 11 FLANGER BASS 21 RUMBLE OD
02 STUDIO SQUEEZE 12 BAY AREA PUNK 22 BIG ECHO
03 RUMBLE 13 PUNCHY OCTAVE 23 WAH ECHO
04 ELEKTRIK UPRIGHT 14 CHORUS 24 WARM WAH
05 DIRTY ROCKBASS 15 FILTHY PUNCH 25 SHOWMAN OD
06 FAT OLD BASSMAN 16 HAND OF DOOM 26 HESHER
07 ORGAN TONE 17 70S ROCK 27 PHASER BASS
08 SLAP BASS 18 FAT BOTTOM 28 TREMOLO
09 SYNTH FUZZ 19 MONSTER BOT 29 AUDIO RAGE
10 VINTAGE FUZZ 20 GRUNGE 30 CLICKY PICK
Additionally, 20 more presets are available using the “REPLACE” function described on page 7. These are:
31 DARK ROOM 38 STEP AND GRIND 45 BASS ODYSSEY
32 BIG SUSTAIN 39 SHOWMAN BOT WAH 46 300 GRIT
33 SPACE PAD 40 GRITS N CREAM 47 FEEL THE PAIN
34 BUZZ BOMB 41 WARM BOT WAH 48 SLAPPY SCOOP
35 WARM CHORUS 42 HEART BREAKER 49 SOCAL SKA PUNK
36 80S BRIT 43 CHORUS DIRT 50 GOOD TO BE KING
37 MONSTER BOT WAH 44 ANCIENT MARINER
07
ORGAN
TONE

4
EDITING AND SAVING PRESETS
Presets can be easily edited and, if desired, renamed and saved in place or saved in a dierent location. The
controls of each amplier type can be adjusted, or an amp model can be replaced with a dierent one. Simila-
ry, various eects controls can be adjusted, or eects can be removed from or added to a preset.
When a preset is active, the box containing its number is blue, indicating that no edits have been made. Once
an edit is made, the box containing the preset number turns red and the preset title screen will read“UN-
SAVED”. When edits are saved, the preset number box returns to blue and the “UNSAVED” title clears.
ACCESSING PRESET CONTENTS
To access the contents of a preset, press the ENCODER. From the top down, the DISPLAY WINDOW will then
show the number and name of the preset, the amplier type in use, and four boxes that organize the eects
used for that preset (if any). These eects category boxes are labeled STOMP (stompbox), MOD (modulation),
EQ and DELAY. When rst accessing preset contents, the preset name and amplier type are highlighted in blue:
Select the amp model or one of the eects category boxes by turning and pressing the ENCODER. The active
selection is then highlighted in blue:
EDITING AND SAVING AMPLIFIER CONTROL SETTINGS
To edit and save individual control settings of a preset’s amplier model, rst select the amp model by press-
ing the ENCODER on it. The DISPLAY WINDOW will then show a list of controls for the amp model in use:
23 WAH ECHO
AMPLIFIER
STOMP
EQ
MOD
DELAY
BIG RUMBLE
PRESET NAME AND NUMBER
AMPLIFIER TYPE
EFFECTS CATEGORY BOXES
AMPLIFIER
80S ROCK
STOMP MOD
REV
23 WAH ECHO
AMPLIFIER
STOMP MOD
DELAY
BIG RUMBLE
EQ
23 WAH ECHO
AMPLIFIER
STOMP
EQ
MOD
DELAY
BIG RUMBLE
7.0
5.5
5.5
10.0
BASS
GAIN
MIDDLE
VOLUME
BIG RUMBLE
5.5TREBLE

There are two ways to adjust an amp control knob setting. A control parameter that corresponds to an actual
physical knob on the control panel can be adjusted simply by turning the physical control knob until the
desired value is reached in the DISPLAY WINDOW. In the example below, the amp model’s MIDDLE setting is
adjusted by turning the physical MIDDLE control knob on the control panel:
Alternately, select a control parameter by turning and pressing the ENCODER; its surrounding box will turn
from blue to red:
The control can then be adjusted by turning the ENCODER or by turning a corresponding physical control
knob on the control panel (if present*):
*
At this point, press the ENCODER or the BACK utility button (green arrow) to accept the adjusted control val-
ues. Pressing BACK returns the user to the preset contents screen; pressing the ENCODER lets the user contin-
ue making controls setting changes, and the box surrounding the control setting will return to blue. When
control setting edits are complete, press the SAVE utility button to save the changes to the preset.
5
5.8TREBLE
7.3
4.1
6.4
VOLUME
GAIN
BASS
80S ROCK
4.5MIDDLE
7.9TREBLE
7.0
5.5
5.5
10.0
BASS
GAIN
MIDDLE
VOLUME
BIG RUMBLE
5.5TREBLE
GAIN BASS
MIDDLE TREBLE MASTER
7.0
5.5
10.0
BASS
GAIN
VOLUME
BIG RUMBLE
5.5TREBLE
5.5MIDDLE
5.8TREBLE
7.0
5.5
10.0
BASS
GAIN
VOLUME
BIG RUMBLE
5.5TREBLE
5.5MIDDLE
7.0
5.5
10.0
BASS
GAIN
VOLUME
BIG RUMBLE
5.5TREBLE
7.9MIDDLE
5.8TREBLE
7.0
5.5
10.0
BASS
GAIN
VOLUME
BIG RUMBLE
5.5TREBLE
7.9MIDDLE
GAIN BASS
MIDDLE TREBLE MASTER
Note that for control parameters such as VOLUME that have no corresponding physical knob
on the control panel, this is the only method of adjustment.
7.0
5.5
10.0
BASS
GAIN
VOLUME
BIG RUMBLE
5.5TREBLE
7.9MIDDLE

IMPORTANT: If edited amp control settings are not saved, the preset will revert to its original amp control
settings when returning to the preset after leaving it, or when turning the amplier o and back on again. To
save edited amp control settings, press the SAVE utility button and use the ENCODER to scroll to one of three
options—SAVE, SAVE AS or REPLACE. Each is detailed below.
SAVE: Keeps an edited preset in the same location with the same name. To do this, press the SAVE utility
button and use the ENCODER to scroll to “SAVE”. Press the SAVE utility button again or press the ENCODER. A
brief “PRESET SAVED!” screen will then ash before returning to the original preset screen:
SAVE AS: Enables saving an edited preset in a dierent position, with or without a dierent name. To do this, press
the SAVE utility button and use the ENCODER to scroll to“SAVE AS”. Press the ENCODER to access a“CHOOSE SLOT”
list of locations where the preset can be moved. Select a new location by turning and pressing the ENCODER:
NOTE: When using “SAVE AS”, note that a preset can be moved to a dierent position even if no edits have been made.
Also note that saving a preset to a dierent location permanently deletes the previous contents of the new location.
Whether renaming the preset or not when using “SAVE AS”, a name must be entered by pressing the ENCOD-
ER to activate a cursor, then spelling out the name by turning and pressing the ENCODER to scroll through
and select characters. All characters can be cleared by using the ENCODER to scroll to and select “CLEAR ALL”.
When name entry is completed for the new location, save it by pressing the SAVE utility button or by using
the ENCODER to scroll to and select “SAVE”. A brief “PRESET SAVED!” screen will then ash before returning to
the original preset screen:
6
02
STUDIO
SQUEEZE
SAVE
REPLACE
SAVE AS
PRESET SAVED!
02
STUDIO
SQUEEZE
SAVE
REPLACE
SAVE AS
04 ROCK A B...
07 ORGAN T...
06 FAT OLD...
08 SLAP BASS
10 VINTAGE...
09 SYNTH FU...
CHOOSE SLOT
S T U D I O _ _
Q U E E Z E _
S
SAVE
CLEAR ALL
RENAME
PRESET SAVED!

REPLACE: Any existing preset can be replaced with another by pressing the SAVE utility button, using the
ENCODER to scroll to and select “REPLACE”and choosing from 50 replacement presets (the 30 factory pre-
sets, plus 20 additional presets listed on page 3). After selecting “REPLACE”, use the ENCODER to scroll to any
of the 50 available presets; each one is automatically “previewed”so the user can hear the sound before the
preset is loaded. Press the ENCODER to select the preset, conrm it by using the ENCODER to scroll to and
select “NO CANCEL” or “YES REPLACE” (not shown) and save and save it in the chosen slot:
CHANGING THE AMPLIFIER MODEL IN A PRESET
The amplier model in a preset can be replaced with another one (see list of Rumble LT25 amplier models on
page 8). To do this, acess the contents of a preset by pressing the ENCODER on it; the amp model will au-
tomatically be highlighted. Press the ENCODER again to see a list of controls for the amp model in use; the
name of the amp model appears at the top of this list.
Press the ENCODER once more to activate the amplier replacement function; the box surrounding the amp
name will turn from blue to red, and white arrows will bracket the amp name. Turn the ENCODER to scroll to a
new amp model. Press the ENCODER to accept the amp model change, after which the box surrounding the
amp name will return to blue; or press the BACK utility button (green arrow) to accept the amp model change
and return to the preset contents screen:
IMPORTANT: If an amplier replacement is not saved, the preset will revert to its original amp type when re-
turning to the preset after leaving it, or when turning the amplier o and back on again. To save a preset amp
replacement, follow the SAVE, SAVE AS or REPLACE instructions on page 6 and at the top of this page.
7
18 AUDIO RA...
AMPLIFIER
STOMP
EQ
MOD
DELAY
ARENA BASS
5.5
6.5
3.2
6.8
BASS
GAIN
MIDDLE
VOLUME
ARENA BASS
6.5TREBLE
BURN
5.5
7.1
3.7
8.6
BASS
GAIN
MIDDLE
VOLUME
4.2TREBLE
MONSTER
5.5
7.1
3.7
8.6
BASS
GAIN
MIDDLE
VOLUME
4.2TREBLE
MONSTER
02
STUDIO
SQUEEZE
SAVE
REPLACE
SAVE AS
SAVE
SAVE AS
SUPER
ROCK
SAVE
SAVE AS
PRESS SAVE
TO CONFIRM
17 / 50
REPLACE
70S ROCK

8
RUMBLE LT25 AMPLIFIER MODELS
This table lists the amp models in Rumble LT25. The amp label used in each preset appears in the lefthand
column, followed by the amp type and a brief description in the righthand column.
STUDIO 1 Direct-to-mixing-desk studio purity with clean, uncolored tonal response
STUDIO 2 Similar to the above, but like a tube console for increased harmonic coloration
RUMBLE Based on the clean-to-gritty 2x10” tone of Fender’s best-selling bass amps
BIG RUMBLE Same as above, but with the added boom of a 1x15 cab
WARM COMBO Based on the beloved mid-’60s Ampeg B-15NF
ARENA BASS Inspired by the seismic all-tube sound of the Ampeg SVT
CLEAN BASS Based on the ’80s/’90s-era power and clarity of the Gallien-Krueger 800RB
SLAP BASS Inspired by the full-range high-end 1990s indispensability of the SWR® Redhead
BASS 300 Based on Fender’s Bassman® 300 Pro all-tube giant with distinctively versatile tone
shaping and blendable overdrive
MONSTER High-gain all-tube boutique guitar amp re-imagined for bass
OLD FENDER Based on the original-era boom of Fender’s vintage “TV-Front” Bassman
SHOWMAN Based on the ’60s/’70s all-tube Fender classic Dual Showman, used on big stages
everywhere
GRUNGE BASS Inspired by the “sludgy” majesty of 1970s-era Orange amps
70S ROCK Inspired by a late ’60s/early ’70s Marshall Super Bass, a quintessential
early hard-rock bass amp
ANGRY BRIT Inspired by the ’80s metal tone of the Marshall JCM800 guitar amp
BASSMAN 2K Based on Fender’s present-day agship Super Bassman amp, with blendable tube
overdrive
Champ, Deluxe, Bassman, Princeton, Deluxe Reverb and Twin Reverb are trademarks of FMIC. All other non-FMIC product names and trademarks appearing in this manual
are the property of their respective owners and are used solely to identify the products whose tones and sounds were studied during sound model development for this
product. The use of these products and trademarks does not imply any aliation, connection, sponsorship, or approval between FMIC and with or by any third party.
PRESET AMP LABEL AMP TYPE AND DESCRIPTION

9
EDITING AND SAVING EFFECTS CONTROL SETTINGS
To edit and save individual control settings of a preset’s various eects (if any), rst select the eect category box
containing the eect to be edited by turning and pressing the ENCODER. There are four eects category boxes
that can each contain one eect: STOMP (stompbox), MOD (modulation), EQ and DELAY:
The DISPLAY WINDOW will then show a list of controls for the eect model in use in that category; use the EN-
CODER to scroll to a particular eect control. Press the ENCODER to select the eect control; its surrounding
box will turn from blue to red. Turn the ENCODER to set a new value for the selected control value:
At this point, press the ENCODER to accept the adjusted eect control value and exit edit mode; the sur-
rounding box will then return to blue. Alternately, press the BACK utility button (green arrow) to accept the
eect control value change and return to the preset contents screen:
IMPORTANT: If an edited eect control setting is not saved, the preset will revert to its original eect control
settings when returning to the preset after leaving it, or when turning the amplier o and back on again. To
save edited eect control settings, follow the SAVE, SAVE AS or REPLACE instructions on pages 6 and 7.
AMPLIFIER
EQ
MOD
ARENA BASS
STOMP
DELAY
29 AUDIO RA...
3.8
3.2
10.0
DECAY
LEVEL
TONE
HALL RVRB
7.6
3.2
10.0
DECAY
LEVEL
TONE
HALL RVRB
7.6
7.6
7.6
3.2
10.0
DECAY
LEVEL
TONE
HALL RVRB

REPLACING, ADDING AND DELETING EFFECTS
As noted, each of the four eect category boxes can contain one eect. If an eect is present, it can be re-
placed with another eect in that category, or it can be deleted. If no eect is present, one can be added (see
list of Rumble LT25 eect models on pages 13-14). The signal path is Instrument—Stompbox—Modulation—Am-
plier—EQ—Delay/Reverb—Speaker, as illustrated at left below.
Note that eects category boxes that already contain an eect have a solid outline, whereas eects category
boxes that do not contain an eect have a dotted outline, as seen in the image at right below:
To replace an eect, access the contents of a preset by pressing the ENCODER on it, then use the ENCODER
to scroll to one of the four eect category boxes. Press the ENCODER again to see the eect contained in the
eect category box; the name of the eect model is highlighted at the top of the DISPLAY WINDOW:
Press the ENCODER once more to activate the eect replacement function; the box surrounding the eect
name will turn from blue to red, and white arrows will bracket the eect name. Turn the ENCODER clockwise
to scroll through other eects models in that category. Press the ENCODER to accept a replacement eect
and exit edit mode; the surrounding box will return to blue. Alternately, press the BACK utility button (green
arrow) to accept the replacement eect and return to the preset contents screen:
10
AMPLIFIER
EQ
MOD
ARENA BASS
STOMP
DELAY
29 AUDIO RA...
DOTTED OUTLINE (NO
EFFECT PRESENT)
SOLID OUTLINE
(EFFECT PRESENT)
AMPLIFIER
EQ
MOD
ARENA BASS
STOMP
DELAY
29 AUDIO RA...
3.8
3.2
10.0
DECAY
LEVEL
TONE
HALL RVRB
5.5
400 MS
3.2
TIME
LEVEL
FEEDBACK
ECHO
5.5WOW
5.5
400 MS
3.2
TIME
LEVEL
FEEDBACK
ECHO
5.5WOW
BASS
AMPLIFIER
STOMP
EQ
MOD
DELAY/
REVERB
SPKR
Rumble LT25 signal path

To delete an eect, the steps are very similar to those on page 10. As before, access the contents of a preset
by pressing the ENCODER on it, then use the ENCODER to scroll to an occupied eect category box. Press the
ENCODER again to see the eect contained in the eect category box; the name of the eect model is high-
lighted at the top of the DISPLAY WINDOW:
Press the ENCODER once more to activate the eect replacement function; the box surrounding the eect
name will turn from blue to red, and white arrows will bracket the eect name. Turn the ENCODER counter-
lockwise until the red-highlighted eect label at the top of the DISPLAY WINDOW reads “NONE”. Press the
ENCODER on “NONE” (or press the BACK utility button), after which the user is returned to the preset screen
with the previously occupied eect category box now empty:
To add an eect to an empty eect category box, rst access the contents of a preset by pressing the ENCOD-
ER on it, then use the ENCODER to scroll to the empty eect category box. Press the ENCODER again to access
the empty eect category box; the red-highlighted label“NONE” bracketed by white arrows will appear at the
top of the DISPLAY WINDOW:
Turn the ENCODER clockwise to scroll through eects models in that category. Press the ENCODER on the
desired eect, after which the box surrounding the eect name will return to blue and the eect is added—
although not yet saved—to that eect category box. Alternately, press the BACK utility button (green arrow)
to return to the preset contents screen (see illustrations on next page):
11
AMPLIFIER
EQ
MOD
ARENA BASS
STOMP
DELAY
29 AUDIO RA...
3.8
3.2
10.0
DECAY
LEVEL
TONE
HALL RVRB
NONE
29 AUDIO RA...
AMPLIFIER
EQ
MOD
ARENA BASS
STOMP
DELAY
STOMP
23 WAH ECHO
AMPLIFIER
EQ
MOD
DELAY
BIG RUMBLE
STOMP
NONE

MIDTYPE
COMPRESSOR
12
MIDTYPE
COMPRESSOR
IMPORTANT: If an eect is not saved once it has been replaced, deleted or added, the preset will revert to
its original eect model(s) when returning to the preset after leaving it, or when turning the amplier o
and back on again. To save a changed, deleted or added eect model, follow the SAVE, SAVE AS or REPLACE
instructions on pages 6 and 7.
SETTING DELAY TIMES WITH THE TAP BUTTON
There are two ways to set delay times for eects in Rumble LT25’s “DELAY” eects category box. The rst way
is to use the “Editing and Saving Eects Control Settings”instructions found on page 9, using the ENCODER
to scroll to, select and adjust individual eect settings, including delay time.
The second way is to use Rumble LT25’s TAP utility button (yellow arrow). If a preset includes a delay eect, the
TAP LIGHT (green arrow) ashes in time with that eect’s default delay time. This time setting can be modied
by tapping the TAP utility button two or more times at the desired tempo, regardless of what screen is shown
in the DISPLAY WINDOW:
IMPORTANT: If an edited delay time is not saved, the eect will revert to its original delay time when return-
ing to the preset after leaving it, or when turning the amplier o and back on again. To save an edited delay
time, follow the SAVE, SAVE AS or REPLACE instructions on pages 6 and 7.

RUMBLE LT25 EFFECT MODELS
This table lists the eect models in Rumble LT25, organized into the four categories that appear in each preset—
STOMP (stompbox), MOD (modulation), EQ and DELAY/REVERB. The eects labels used in each preset appear in
the lefthand column, followed by the eects types and a brief description in the righthand column. Note that
STOMP and MOD are“pre”eects; that is, they come before the amp model in the signal path. EQ and DELAY/RE-
VERB are“post” eects, placed after the amp model in the signal path.
STOMPBOX EFFECTS
OVERDRIVE Versatile Fender overdrive specially designed for exibilty
BLUES DRIVE Overdrive eect inspired by the original late-’70s Ibanez TS808 Tube Screamer
BASS DRIVE Inspired by the snarl of the Tech 21 SansAmp Bass Driver pedal
ROCK DIRT Distortion eect inspired by the Pro Co RAT
FUZZ Versatile Fender fuzz with variable low-end response specially designed for Rumble LT25
OCTOBOT Synth-like combination of octave-down eect plus octave-up fuzz
COMPRESSOR Compressor with added gain, threshold, attack and release controls
SUSTAIN Inspired by the MXR M-163 Sustain, a rare 1980s compressor pedal with an especially
strong compression eect and short attack time
5-BAND EQ Five-band graphic equalizer
MODULATION EFFECTS
CHORUS Distinctive chorus eect that uses a triangle wave for modulation
FLANGER Distinctive anging eect that uses a triangle wave for modulation
VIBRATONE Classic late-’60s/early-’70s Fender eect with a rotating speaker bae
TREMOLO Smoothly pulsating tube bias tremolo, as heard in amps
such as the Fender Princeton Reverb
PHASER Long-indispensable jetliner“whoosh” heard on countless recordings
STEP FILTER Rhythmically choppy eect that dices notes into distinctly alternating “steps”
TOUCH WAH Wah eect controlled by picking dynamics rather than an expression pedal
All non-FMIC product names and trademarks appearing in this manual are the property of their respective owners and are used solely to identify the products whose tones
and sounds were studied during sound model development for this product. The use of these products and trademarks does not imply any aliation, connection, sponsor-
ship, or approval between FMIC and with or by any third party.
13

EQ
5-BAND EQ Five-band graphic equalizer
DELAY/REVERB EFFECTS
Note that the control panel TAP utility button and TAP LIGHT work in connection with eects in this category only.
DELAY Clean, simple and pristine signal repetition
REVERSE Reverses the delayed signal for the classic “backwards guitar” eect
ECHO Tape delay eect based on the analog classic Maestro Echoplex, which had tape im-
perfections that created distinctive“wow” and “utter”
HALL REVERB Strong, bright reverb simulating the size of, for example, a major
performance hall and other large, cavernous spaces
ROOM REVERB Warmer, less echo-y reverb typical of smaller spaces and classic echo chambers
All non-FMIC product names and trademarks appearing in this manual are the property of their respective owners and are used solely to identify the products whose tones
and sounds were studied during sound model development for this product. The use of these products and trademarks does not imply any aliation, connection, sponsor-
ship, or approval between FMIC and with or by any third party.
14
MENU FUNCTIONS
Rumble LT25 features four convenient MENU functions—TUNER, FOOTSWITCH, SETTINGS and RESTORE—all
easily accessed by pressing the MENU utility button. The rst function (TUNER) is automatically highlighted;
use the ENCODER to scroll to and select any MENU function:
TUNER: Enables use of Rumble LT25’s built-in chromatic tuner (page 15).
FOOTSWITCH: For conguring Rumble LT25’s single-button footswitch to provide easy hands-free selection
of any two presets (page 16).
SETTINGS: Displays the rware version (page 17). Also includes a gain control for use when recording using
the USB audio port on the control panel (page 18).
RESTORE: Enables restoration of factory presets and amplier settings (page 17).
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU

MENU FUNCTION: TUNER
There are two ways to access Rumble LT25’s built-in chromatic tuner. The rst way is to press and hold the TAP
utility button on the control panel until the tuner screen appears in the DISPLAY WINDOW:
The second way is to press the MENU utility button on the control panel; the list of MENU functions will
appear in the DISPLAY WINDOW with the TUNER function automatically highlighted atop the list. Press the
ENCODER on TUNER to access the tuner screen:
To use the TUNER, sound a note; the letter name of the pitch will appear in the box at bottom and the shorter
vertical bars on either side of the longer vertical center bar will illuminate red to indicate varying degrees of
sharpness (to the right) or atness (to the left). When a pitch is precisely in tune, the longer vertical center bar
and the two shorter vertical bars on either side of it will illuminate green:
Note that speaker output is muted when tuning, and that the volume control on the instrument being tuned
must be turned up suciently to register a TUNER reading.
15
TUNER
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
TUNER
TUNER
A
TUNER
A
“A” PITCH SLIGHTLY FLAT “A” PITCH IN TUNE

MENU FUNCTION: FOOTSWITCH
Connect an optional Fender single-button footswitch (PN 0994052000) by plugging it into the“FTSW” jack
on the control panel. The footswitch provides convenient hands-free switching between two pre-determined
“quick-access” presets. The second MENU function—FOOTSWITCH—enables easy conguration of any two
presets for quick-access footswitch use. To do this, press the MENU utility button, then use the ENCODER to
scroll to and select FOOTSWITCH:
Two presets will be shown in the DISPLAY WINDOW below the header “QUICK ACCESS”; the upper preset is au-
tomatically highlighted in blue. To choose a new preset for this upper quick-access position, press the ENCOD-
ER on it; the box surrounding the preset name will turn red. Use the ENCODER to scroll to a new preset for the
upper quick-access position:
Press the ENCODER to select the new upper quick-access preset; the box surrounding the preset name will
return to blue. To choose a new preset for the lower quick-access position, turn the ENCODER clockwise to
highlight the lower preset, then follow the same steps as above:
IMPORTANT: If quick-access footswitch presets are not saved, the quick-access preset slots will revert to
their original contents when returning to the preset after leaving it, or when turning the amplier o and
back on again. To save quick-access footswitch presets, follow the SAVE, SAVE AS or REPLACE instructions on
pages 6 and 7.
16
07
ORGAN
TONE
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
02
STUDIO SQUE
01
STUDIO CLEA
QUICK ACCESS
02
STUDIO SQUE
17
70S ROCK
QUICK ACCESS
02
STUDIO SQUE
17
70S ROCK
QUICK ACCESS
17
70S ROCK
QUICK ACCESS
03
RUMBLE

MENU FUNCTION: SETTINGS
The third MENU function—SETTINGS—displays the current rmware version and features a gain control for
use when recording using the USB port on the control panel. To access these options, press the MENU util-
ity button and use the ENCODER to scroll to and select SETTINGS. The USB gain control appears at top (see
instructions under “USB PORT”, page 18), with the rmware version below (“VERSION”):
Be sure to check fender.com/rmware/support regularly for rmware updates that improve and enhance the
Rumble LT25 experience.
MENU FUNCTION: RESTORE
The fourth MENU function—RESTORE—enables restoration of all original factory presets and amplier set-
tings. To do this, press the MENU utility button, then use the ENCODER to scroll to and select RESTORE:
To initiate restoration use the ENCODER to scroll to and select “YES RESTORE”. To cancel restoration, press the
ENCODER on “NO CANCEL”, or press the BACK utility button. While restoration is in progress, a blue waiting
screen will briey appear. When restoration is complete, the user is returned to the rst preset screen:
17
+6.0USB GAIN
VERSION
0.3.8
SETTINGS
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
07
ORGAN
TONE
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
FACTORY
RESTORE?
YES RESTORE
NO CANCEL
RESTORE
RESTORING
FACTORY
SETTINGS
PLEASE WAIT...

18
AUXILIARY INPUT AND HEADPHONE OUTPUT
The Rumble LT25 control panel features two 1/8”-inch jacks: an auxiliary input
for connecting external mobile/audio devices and an output for convenient
headphone use.
Note that when using the auxiliary input, volume levels for external devices
are set using volume controls on the external devices themselves (the amp’s
volume controls are for overall volume level only and do not aect individual
volume of external devices connected to the auxiliary input jack). Also note
that when headphones are plugged in, speaker output is muted.
GAIN
USB PORT
The Rumble LT25 control panel features a USB port for audio recording. Using a micro USB
cable (not included), connect a computer with recording software to this port. No external
driver is needed to connect to an Apple computer. To connect to a Windows-based com-
puter, the user must download the ASIO driver setup with Fender Mustang device, avail-
able at www.fender.com/support/articles/fender-universal-asio-drive.
Note that although the USB port and the auxiliary input can be used simultaneously, the
USB port cannot be used to record a signal from the auxiliary input.
When recording using the USB port, a gain control is located in the SETTINGS menu func-
tion (page 17). To access and use this gain control, press the MENU utility button and use the
ENCODER to scroll to and select SETTINGS; “USB GAIN”will automatically be highlighted. Press the ENCODER on
“USB GAIN”to select it; the surrounding box will turn from blue to red:
Turn the ENCODER to set a new“USB GAIN”value. Press the ENCODER to accept the new value; the surround-
ing box will return to blue (not shown). Alternately, press the BACK utility button (green arrow) to accept the
new value and return to the MENU function screen:
Note that the “USB GAIN” control in the SETTINGS menu function is the only one that aects USB recording;
the actual physical GAIN control knob on the control panel does not aect USB recording.
GAIN
FOOTSWITCH
TUNER
RESTORE
SETTINGS
MENU
+6.0USB GAIN
VERSION
0.3.8
SETTINGS
+8.5USB GAIN
VERSION
0.3.8
SETTINGS