Operation Manual

You must read the Usage and Safety Precautions before use.
©2023 ZOOM CORPORATION

Notices

Copying or reprinting this manual in part or in whole without permission is prohibited.

Product names, registered trademarks and company names in this document are the property of their respective companies. All trademarks and registered trademarks in this document are for identification purposes only and are not intended to infringe on the copyrights of their respective owners.

Proper display is not possible on grayscale devices.

Notes about this Operation Manual

You might need this manual in the future. Always keep it in a place where you can access it easily.

The contents of this document and the specifications of the product could be changed without notice.

  • Microsoft and Windows are trademarks of the Microsoft group of companies.

  • iPadOS, Lightning and Mac are trademarks of Apple Inc.

  • App Store is a service mark of Apple Inc.

  • iOS is a trademark or registered trademark of Cisco Systems, Inc. in the USA and other countries, and it is used under license.

  • Android is a trademark of Google LLC.

  • USB Type-C is a trademark of the USB Implementers Forum.

  • Other product names, registered trademarks and company names in this document are the property of their respective companies.

  • All trademarks and registered trademarks in this document are for identification purposes only and are not intended to infringe on the copyrights of their respective owners.

  • The illustrations and display screens in this document could differ from the actual product.

Terms used in this manual

Patch memory

Patch memories store effects and amps used, effect on/off states and parameter setting values, allowing easy recall. Effects are saved and recalled in units of patch memories. Up to 5 effects can be added to a patch memory, and up to 300 patch memories can be stored.

Effect type

The available effect types include various bass effects and amp/cabinet simulation models. Effects can be selected from these types to be added to patch memories.

Category

Effects are grouped by types into categories.

Autosave

This function automatically saves changes to patch memory and effect settings.

ECO mode

This function will automatically turn the power off 10 hours after the last operation.

Looper

Mono phrases that are up to 60 seconds long can be recorded and played back repeatedly.

This can be synchronized with rhythm patterns.

Preselect

This function allows continued use of the current patch memory sound while switching to another patch memory at a distant number.

B2 FOUR structure

Signal flow

Patch memory
The input bass sound passes through effects, followed by amp and speaker cabinet models, in order. (→ Adjusting effect parameters)
Looper
Recorded loops can be played back. (→ Using the looper while playing)
Rhythm
Drum sounds can be played back using internal rhythm patterns. (→ Using rhythms)
DI MODEL
DI models that emulate the characteristics of tube and solid-state types can be selected. (→ Selecting the DI MODEL)
Tuner
This can be used to tune connected basses. (→ Using the tuner)
Master EQ
This adjusts the overall tonal character. This setting is retained even when the patch memory is changed. (→ Adjusting the overall tonal character and output level)
Master volume
This adjusts the overall volume. This setting is retained even when the patch memory is changed. (→ Adjusting the overall tonal character and output level)
Balanced output
This is output from the BALANCED OUTPUT jack. Connect this to a PA mixer, for example.
USB audio
Audio data can be exchanged with computers and smartphones using the audio interface function. (→ Using audio interface functions)
AUX INPUT
Audio can be played back from a smartphone, portable audio player or other device.
OUTPUT
An amp or powered monitors can be connected.
PHONES
Headphones can also be connected.

Memory overview (patch memories)

Patch memories

These store the effects used, their order, on/off states and parameter settings. Effects can be saved and recalled in patch memory units. 300 patch memories can be stored.

Functions of parts

Top

Direction buttons
Use these to select patch memories and effects, for example.

They can be operated by foot.

Display
This shows information, including the names of the selected patch memory and its effects along with their parameter values.
Parameter knobs
Use these to adjust effect parameters and make various settings.
Footswitches/indicators
Use these to select patch memories and turn effects on/off.

When the EFFECT Screen is open, the indicators show whether effects are on or off.

DI MODEL switch
Use this to select the DI MODEL. (The selected model lights.)
Bypass switch
This turns bypassing on/off.

Back

GROUND CONNECT/LIFT switch
The BALANCED OUTPUT jack can be connected or disconnected from the ground.
BALANCED OUTPUT jack
Connect this to a PA system.
Impedance selection switch
Set the impedance to suit the connected bass.
INPUT jack
Connect a bass to this.
AUX INPUT jack
Connect a portable music player or similar device here.
OUTPUT jacks
Connect a bass amp or powered monitors here.
EXPRESSION PEDAL jack
Connect an expression pedal (ZOOM FP02M) here, and use it to adjust a pedal effect.
POWER switch
This turns the power on/off.
DC 9V AC adapter connector
Connect the dedicated AC adapter (ZOOM AD-16) here.

Side

USB (Type-C) port
Connected to a computer, smartphone or tablet, this can be used as an audio interface.

In addition, Handy Guitar Lab can be used to manage patch memories and edit and add effects, for example, from a smartphone or tablet.

This supports operation on USB bus power.

PHONES output jack
Connect headphones here.
HINT

Handy Guitar Lab for B2 FOUR can be downloaded from the App Store.

Screens that appear on the display

The B2 FOUR is operated with buttons and knobs while viewing the display. This section explains the screens shown on the display.

MEMORY Screen

This opens when the power is turned on.

This shows patch memories, allowing them to be selected for performing and editing.

Patch memory numbers
Footswitches – can be used to select the patch memories that are shown currently.

Use / to select a patch memory one lower or higher. Use / to select a patch memory 10 places away.

The selected patch memory is highlighted.

Patch memory name
This shows the name of the selected patch memory.

Opening the MEMORY Screen

EFFECT Screen

Patch memories can be edited.

Effects
This shows the effects in the selected patch memory.

Use and to select effects. The selected effect will appear slightly raised.

Name of current patch memory
Effects that are being shown
Up to 3 effects can be shown on the display. The black circles indicate the positions of the effects that are being shown.

Opening the EFFECT Screen

Library Screen

Effects in patch memories can be changed.

Selected effect
The selected effect is shown larger and in the center.
Effect list
Effects in the same category are lined up vertically. Use and to select effects in the same category.

Use and to select effects in different categories.

Opening the Library Screen

Select the effect to be changed on the EFFECT Screen, and press or .

Exiting the Library Screen

Press to confirm the selected effect and open the EFFECT Screen.

MENU Screen

Various B2 FOUR settings can be made.

Setting items
Use and to select the setting items shown with icons.
Footswitches
Press footswitches – that correspond to the icons shown on the screen to open their settings screens.

Using the MENU Screen

  1. Press and hold to open the MENU Screen.

  2. Use and to show the icon for the desired setting item.

    See the reference links for details about each setting.

    Change the effect order. (→ Changing the order of effects)Change the patch memory name. (→ Changing patch memory names)
    Save and copy patch memories. (→ Copying and saving patch memories)Delete patch memories. (→ Deleting patch memories)
    Turn the pre-selection function on/off. (→ Using the PRESELECT function)Turn the automatic saving function on/off. (→ Setting the AUTO SAVE function)
    Restore factory default settings. (→ Restoring factory default settings)Turn the ECO mode on/off. (→ Setting the ECO mode)
    Check the firmware versions. (→ Checking the firmware versions)Adjust the display contrast. (→ Adjusting the display contrast)
  3. Press a – footswitch that corresponds to an icon.

    This opens the selected settings screen.

    For example, press when AUTO SAVE is selected.

  4. Use , , and to select a setting.
  5. Press .

    This confirms the setting and returns to the MEMORY Screen or EFFECT Screen.

Making connections

Bass
Set the impedance selection switch to suit the connected bass.
Use this with regular electric basses.
Use this with acoustic basses that have piezo pickups.
Portable music player, etc.
Adjust the volume on the connected device.
AC adapter (ZOOM AD-16)
Powered monitors
Bass amp
Expression pedal (ZOOM FP02M)
A pedal can be used to control effects.
PA mixer, etc.
Use to enabled/disable ground connection for the BALANCED OUTPUT jack.
This connects the ground pin to the ground.
This disconnects the ground pin from the ground.

This is useful if noise is caused by a ground loop.

Computer (Mac/Windows), smartphone or tablet
Connect with a USB cable (Type-C).

The B2 FOUR can be used as an audio interface and with Handy Guitar Lab.

Headphones
HINT

The Handy Guitar Lab for B2 FOUR app (iOS/iPadOS) can be used to manage patch memories and to edit and add effects. Handy Guitar Lab for B2 FOUR can be downloaded from the App Store.

Turning the power on/off

Turning the power on

  1. Minimize the volume of the amp or powered monitors.
    NOTE

    To prevent noise and malfunction, connect powered monitors and bass amps before turning the power on.

  2. Set to ON.

    This turns on the B2 FOUR and opens the MEMORY Screen.

  3. Raise the volume of the amp or powered monitors.
    ECO mode overview

    • By default, ECO mode is set to ON, so the power will automatically turn off if no use occurs for 10 hours.

    • ECO mode can also be turned OFF. (→ Setting the ECO mode)

Turning the power off

  1. Minimize the volume of the amp or powered monitors.
  2. Set to OFF.

    The display will turn off.

Selecting the DI MODEL

The DI MODEL section of the B2 FOUR has 6 selectable types that reproduce the characteristics of vacuum tube and solid-state DIs.

The DI MODEL affects the output of the BALANCED OUTPUT, OUTPUT and PHONES jacks.

  1. Press to select the DI MODEL.
    TUBE 1This models the characteristics of a vacuum tube DI with rich harmonics and thick low frequencies.
    TUBE 2This models the characteristics of a vacuum tube DI with a clear attack and tight low frequencies.
    TUBE 3This models the characteristics of a vacuum tube DI with a clear beautiful sound.
    SOLID STATE 1This models the characteristics of a solid-state DI with moderate compression and a sharp tone.
    SOLID STATE 2This models the characteristics of a solid-state DI with a clear tone and little distortion.
    SOLID STATE 3This models the characteristics of a solid-state DI evocative of the Motown sound.
    OFFThis turns off the DI MODEL.

Using the bypass function

All B2 FOUR effects and the DI MODEL can be bypassed. Bypassing only the effects section is also possible.

  1. Press .

    This bypasses the effects section and the DI MODEL.

  2. Press and hold .

    This bypasses the effects section.

    ALL BYPASSThis bypasses the effects section and the DI MODEL.
    EFX BYPASSThis bypasses the effects section.

    (Only the DI MODEL is used.）

    UnlitThis bypasses nothing.
    HINT

    • Adjusting the EQ and volume of a bass amp, for example, is easier if the B2 FOUR effects are bypassed.

    • The bypass function will be off when the power is turned on.

Adjusting the overall tonal character and output level

The volume and tonal character of sound output from the B2 FOUR can be adjusted. These settings affect the output of the OUTPUT and PHONES jacks.

  1. Press to open the MEMORY Screen.
  2. Turn to adjust the EQ and volume of the output sound.

    Adjust the low, mid and high range as well as the volume.

    After finishing adjustments, the previous screen will reopen after a moment.

Switching patch memories while playing (MEMORY Screen)

The B2 FOUR manages effects in patch memories. Up to 5 effects can be added to a patch memory, and their on/off states and parameter settings can be saved in it.

On the MEMORY Screen, the patch memory being used can be switched while playing.

  1. On the MEMORY Screen, use , , and along with footswitches – to select patch memories.

  • Use / to select a patch memory one lower or higher.

  • / can be used to select a patch memory 10 places away.

  • The patch memories shown on the MEMORY Screen can be selected directly by pressing footswitches – .

    The indicator for the selected patch memory lights.

HINT

  • Up to 300 patch memories can be created.

  • The PRESELECT function can be used when the MEMORY Screen is open. This allows the next patch memory to be selected in advance and then switched to with one press. This is useful for switching to patch memories that are not near the current one when performing live. (→ Using the PRESELECT function)

Using the PRESELECT function

The PRESELECT function can be used when the MEMORY Screen is open.

When the PRESELECT function is ON, using /// will put the patch memory change into standby until footswitch – is pressed to confirm the change.

This makes it possible to switch directly to a patch memory that is not near the current one during live performance.

Turning the PRESELECT function on/off

  1. Press and hold to open the MENU Screen.
  2. Use / to select PRESELECT, and press the corresponding footswitch ( in this example).

    This opens the Preselect Screen.

  3. Press / to turn it on/off.
    SettingExplanation
    ONThis turns on the PRESELECT function.
    OFFThis turns off the PRESELECT function.
  4. Press .

    This confirms the setting and returns to the MEMORY Screen or EFFECT Screen.

Selecting patch memories when the PRESELECT function is on

  1. On the MEMORY Screen, press , , and to select the patch memory to use next.

    Example: Patch memory 012 selected when playing patch memory 001

    The indicator blinks for the footswitch that corresponds to the patch memory selected for use next ( in this case).

  2. Press the footswitch ( – ) with the blinking indicator to confirm the selection.

    The patch memory will switch when – is pressed, and the indicator for the corresponding footswitch will light (not blinking).

Editing effects (EFFECT Screen)

Use the EFFECT Screen to work with effects, including, changing them and adjusting their parameters.

Patch memories can be edited.

Saving changes

  • When the AUTO SAVE function is ON, changes to patch memories will be automatically saved. (This function is ON by default.) (→ Setting the AUTO SAVE function)

  • Patch memories will not be saved automatically if the AUTO SAVE function is OFF. When the content of a patch memory has been changed, will appear at the top right of the display, showing that it is different from the saved settings.

    Save it as necessary. (→ Copying and saving patch memories)

Turning effects on/off

On the EFFECT Screen, the effects and amp used in the patch memory are shown on the display and can be turned on and off using the footswitches.

  1. Open the EFFECT Screen for the patch memory with the effect to be turned on/off (→ Opening the EFFECT Screen).
  2. Use and to show the effect to be turned on/off on the display.

    Three effects are shown on the display. The footswitches can be used to turn on/off the effects shown on the display.

  3. Press footswitches – to turn effects on/off.

    The indicators light when effects are on.

    When an effect is off, its indicator will be unlit and its icon will appear dimmed on the display.

    HINT

    Some effects assign special functions to footswitches. (This includes effects that turn on only while the footswitch is being pressed, for example.) Special functions can be selected on the Effect Editing Screen. (→ Footswitch special functions)

Replacing effects

Effects in a patch memory can be replaced with other effects as desired.

  1. Open the EFFECT Screen for the patch memory with the effect to be replaced (→ Opening the EFFECT Screen).
  2. Use and to select the effect to be replaced.
  3. Press or .

    This opens a list of effects (the Library Screen). On the Library Screen, the sound of the selected effect can be checked by itself.

  4. Use , , and to select an effect.

    • /: Select the higher or lower effect in the same category.

    • /: Select the category to the left or right.

    HINT

    Turning will open the Effect Editing Screen where parameters for the selected effect can be adjusted. (→ Adjusting effect parameters)

  5. Press .

    The selected effect or amp will replace the previous one and the EFFECT Screen will reopen.

    NOTE

    • If an effect in a patch memory has been deleted from Handy Guitar Lab, the deleted effect will appear as and be disabled.

    • A patch memory can only contain one effect from each of these categories: amp, pedal, rhythm and looper.

    • When the Library Screen is open, sound is output using only the selected effect. To check the sound of the entire patch memory, open the MEMORY Screen or the EFFECT Screen.

    HINT

    See Handy Guitar Lab for explanations of each effect.

Adding effects

When a number icon like is shown, no effect has been assigned to that position. To add an effect, select a number icon in step 2. Then, select an effect starting in step 3.

The position of an added effect can be changed by following the instructions in “Changing the order of effects”.

Deleting effects

Select the effect to be deleted in step 2. Then, select a number icon like in step 4.

Note about the number of effects in patch memories

The B2 FOUR can be used to freely combine 5 effects. If the processing capability limit is exceeded, however, a “PROCESS OVERFLOW” warning will appear and effects will be bypassed. Change one of the effects to end this condition.

Adjusting effect parameters

The individual effects used in patch memories can be adjusted.

  1. Open the EFFECT Screen for the patch memory that has the effect with parameters to be adjusted (→ Opening the EFFECT Screen).
  2. Use and to select the effect with parameters to be adjusted.
  3. Turn .

    This opens the Parameter Adjustment Screen for the selected effect.

  4. Turn to adjust the effect parameters.

    After finishing adjustments, the previous screen will reopen after a moment.

    Amps and some other effects have more parameters, so their setting screens have two pages.

    Press and to show the parameter to be adjusted.

    HINT

    • Time, rate and other effect parameters can be set to musical notes to sync them to the tempo. (→ Adjusting the tempo)

    • See Handy Guitar Lab for explanations of each effect.

    • To change, add or delete an effect see “Replacing effects”.

Footswitch special functions

Some effects assign special functions to footswitches, including turning the effect on only while the footswitch is being pressed. Parameters that select special functions appear inverted on the display.

Changing the order of effects

Effects in a patch memory can be reordered as desired.

  1. Open the EFFECT Screen for the patch memory with effects to be reordered (→ Opening the EFFECT Screen).
  2. Use and to select an effect to reorder.
  3. Press and hold to open the MENU Screen.
  4. Use and to select MOVE, and press the corresponding footswitch ( in this example).

    This opens the Move Screen.

  5. Use and to move the effect to the desired position.
  6. Press .

    This confirms the reordering and reopens the EFFECT Screen.

Adjusting the tempo

The tempo used by rhythms, the looper, delay effects and some modulation effects can be adjusted.

Tempo is set separately for each patch memory.

  1. Open the EFFECT Screen for the patch memory with the tempo to be changed (→ Opening the EFFECT Screen).
  2. Use / to select the BPM module.
  3. Press the corresponding footswitch ( in this example).

    The tempo can also be set by tapping the footswitch repeatedly (tap tempo).

    The indicator blinks at the set tempo interval.

    HINT

    • The tempo can be set to 40–250 ♩ per minute (bpm).

    • Turning will open the Tempo Adjustment Screen where the tempo can be set.

      The set tempo is shown on the display.

      After finishing the setting, the screen will return to its previous state after a moment.

Managing patch memories

Changing patch memory names

  1. Show the patch memory with the name to be changed (→ Switching patch memories while playing (MEMORY Screen)).
  2. Press and hold to open the MENU Screen.
  3. Use / to select PATCH NAME, and press the corresponding footswitch ( in this example).

    This opens the PATCH NAME screen.

  4. Use and to move the cursor.
  5. Use and to insert a character.

    • Press and hold / to change the character continuously.

    • Press to delete the character before the cursor.

    • Press and hold to delete all the characters.

  6. Press .

    This confirms the name and reopens the MEMORY Screen.

HINT

The characters and symbols that can be used are as follows.

! % & ' + , - . = _ (space) A–Z, a–z, 0–9

Copying and saving patch memories

The AUTO SAVE function is on by default. When it is off, changes, including adjustments to effects and amps, as well as volume settings, will not be saved automatically. Save changes manually in this case.

Patch memories can also be saved (copied) to other locations.

HINT

See “Setting the AUTO SAVE function” for details about the AUTO SAVE function.

  1. Press and hold to open the MENU Screen.
  2. Use / to select COPY, and press the corresponding footswitch ( in this example).

    This opens the Copy Screen.

    “SAVE” will be shown instead of “COPY” when the AUTO SAVE function is OFF, so select “SAVE” （→Setting the AUTO SAVE function）.

  3. Use and to select the patch memory to copy, and press .
  4. Use and to select the patch memory copy/save destination, and press .

    This copies/saves the patch memory, and reopens the MEMORY Screen.

    Patch memories shown as “Empty” are currently unused.

    HINT

    • In step 3 or 4, pressing to select “CANCEL” and pressing will cancel copying/saving and reopen the MEMORY Screen.

    • Patch memories will not be saved automatically if the AUTO SAVE function is OFF. When the AUTO SAVE function is OFF, if the content of a patch memory has been changed, will appear at the top right of the screen, showing that it is different from the saved settings. (→ Setting the AUTO SAVE function)

    • When the AUTO SAVE function is OFF, “SAVE” will be shown instead of “COPY” in step 2. (→ Setting the AUTO SAVE function)

Deleting patch memories

Unnecessary patch memories can be deleted.

  1. Press and hold to open the MENU Screen.
  2. Use / to select PATCH ERASE, and press the corresponding footswitch ( in this example).

    This opens the PATCH ERASE screen.

  3. Use and to select the patch memory to be deleted.

  4. Press to select ENTER, and press .

    Deleted patch memories will have their contents cleared and be shown as “Empty”.

    HINT

    In step 4, pressing to select “CANCEL” and pressing will cancel deletion and reopen the MEMORY Screen.

Creating patch memories

New patch memories can be created.

  1. Press and hold footswitch .

    This opens the New Screen.

  2. Use and to select where the new patch memory will be saved, and press .

    This creates a new patch memory and opens the EFFECT Screen.

    Assign effects by following the procedures in “Replacing effects” and edit the patch memory.

    NOTE

    Up to 300 patch memories can be saved. The New Screen will not be shown if there are no empty patch memories. Delete unnecessary patch memories to enable use. (→ Deleting patch memories)

    HINT

    In step 2, pressing to select “CANCEL” and pressing will cancel creation and reopen the MEMORY Screen.

Reverting patch memory changes

After changing a patch memory, it can be reset to the state it was in immediately after it was selected or to the factory default state.

  1. Press and hold footswitch .

    This opens the Revert Screen.

  2. Use and to select the desired state.
    SettingExplanation
    PREVIOUSThis reverts the patch memory to its state immediately after selection.
    FACTORYThis reverts the patch memory to its factory default state.

  3. Press .

    This reverts the patch memory to the state selected in step 2 and reopens the MEMORY Screen.

    HINT

    In step 2, pressing to select “CANCEL” and pressing will cancel the operation and reopen the MEMORY Screen.

Using the tuner

Activating the tuner

Enable the tuner to use the B2 FOUR to tune a bass.

  1. Press and hold .

    This activates the tuner and opens the Tuner Screen on the display.

  2. Play the open string that you want to tune and adjust its pitch.

    • The nearest note name and pitch detuning will be shown.

    • The left and right indicators will be shown when the pitch is in tune.

Closing the tuner

Press footswitch – when the tuner is in use to close it and reopen the previous screen.

Changing tuner settings

The standard pitch used by the tuner and the tuner type can be changed. Flat tuning is also possible.

Changing the standard pitch of the tuner

Turn to change the standard pitch.

HINT

The setting range is 430–450 Hz for middle A.

Selecting the tuner type

Turn to select the tuner type.

SettingExplanation
CHROMATICThe pitch detuning is shown according to the nearest note (in semitones).
BASSThis is standard bass guitar tuning with support for 5/6-string basses. The nearest string number is shown according to the selected type, and the amount of detuning from its pitch is shown.

BASS tuning (“LB” is low B and “HC” is high C.)

StringLB4321HC
NoteBEADGC

Using flat tunings

All strings can be tuned flat from an ordinary tuning by 1 (♭× 1 ), 2 (♭× 2 ) or 3 (♭× 3 ) semitones.

Turn to set flat tuning.

NOTE

Flat tuning cannot be used when the tuner type is CHROMATIC.

Using a connected expression pedal

The application of a pedal effect selected in the patch memory can be changed by operating a connected expression pedal (ZOOM FP02M).

Setting pedal effects

  1. Open the EFFECT Screen for the patch memory with the pedal effect to be set (→ Opening the EFFECT Screen).
  2. Use and to select the effect to use for the pedal effect.
  3. Press / to open the Library Screen, and use , , and to select a pedal effect.

    When the Library Screen is open, the sound of the selected effect can be checked by itself.

  4. Press .

    This changes the selected pedal effect and opens the EFFECT Screen.

    NOTE

    Only one effect in a patch memory can be selected from the pedal category.

  5. With the pedal effect selected, turn to adjust its parameters.

    The parameters that can be adjusted depend on the pedal effect.

  6. Use the expression pedal.

    This changes the application of the effect.

    The parameter with added to it on the Effect Editing Screen in step 5 can be adjusted.

Using rhythms

You can play along with built-in rhythms.

Setting the rhythm effect

On the B2 FOUR, one rhythm can be used as an effect, and it can be started and stopped by turning the effect on/off.

Select the rhythm effect on the EFFECT Screen to make various rhythms settings, including rhythm pattern selection and tempo.

Each patch memory can have only one rhythm effect set.

  1. Open the EFFECT Screen for the patch memory with the rhythm effect to be set (→ Opening the EFFECT Screen).
  2. Use and to select the effect to use for the rhythm effect.
  3. Press / to open the Library Screen, and use , , and to select a rhythm effect.

    The rhythm effect is in the column second from the right on the Library Screen.

  4. Press .

    This opens the EFFECT Screen.

  5. Turn to adjust the rhythm effect settings.
    Rhythm pattern
    This selects the rhythm pattern that will be played.

    See Rhythm patterns for information about the rhythm pattern types.

    Pre-count
    This sets whether or not a count sound is played before looper recording starts.

    • OFF: A precount is not played.

    • ON: A precount is played.

    Tempo
    This adjusts the rhythm tempo.

    • This can be set from 40 to 250.

    • The tempo set here is linked to the tempo adjusted in “Adjusting the tempo” and will be shared by the other effects and the looper.

    Volume
    This adjusts the volume of the rhythm.

    • This can be set from 0 to 100.

    HINT

    Rhythm settings can be changed during rhythm playback. (→ Starting/stopping rhythm playback)

Starting/stopping rhythm playback

Rhythm playback can be started and stopped.

  1. Use and to show the rhythm effect on the display.
  2. Press the – footswitch that corresponds to the rhythm effect ( in this example).

    Press that footswitch again to alternate between starting and stopping playback.

    The indicator lights during playback.

    HINT

    • During rhythm playback, it will continue playing even if is pressed to switch to the MEMORY Screen. In this case, switching the patch memory will stop the rhythm.

    • Pressing / to open the Library Screen will stop the rhythm.

Rhythm patterns

No.Pattern NameTime Sig.No.Pattern NameTime Sig.No.Pattern NameTime Sig.
1GUIDE4/424R&B14/447JAZZ24/4
28BEATS14/425R&B24/448FUSION4/4
38BEATS24/42670S SOUL4/449SWING14/4
48BEATS34/42790S SOUL4/450SWING24/4
516BEATS14/428MOTOWN4/451BOSSA14/4
616BEATS24/429HIPHOP4/452BOSSA24/4
716BEATS34/430DISCO4/453SAMBA14/4
8ROCK14/431POP4/454SAMBA24/4
9ROCK24/432POPROCK4/455BREAKS14/4
10ROCK34/433INDIEPOP4/456BREAKS24/4
11ROCKABLY4/434EUROPOP4/457BREAKS34/4
12R'N'R4/435NEWWAVE4/45812/8 GRV12/8
13HARDROCK4/436ONEDROP4/459WALTZ3/4
14HEAVYMTL4/437STEPPERS4/460JZWALTZ13/4
15MTLCORE4/438ROCKERS4/461JZWALTZ23/4
16PUNK4/439SKA4/462CTWALTZ13/4
17FASTPUNK4/4402ND LINE4/463CTWALTZ23/4
18EMO4/441COUNTRY4/4645/4 GRV5/4
19TOMTOMBT4/442SHUFFLE14/465METRO33/4
20FUNK14/443SHUFFLE24/466METRO44/4
21FUNK24/444BLUES14/467METRO55/4
22FUNKROCK4/445BLUES24/468METRO
23JAZZFUNK4/446JAZZ14/4

Using the looper while playing

Playing can be recorded to create mono loop phrases that are up to 60 seconds long.

Setting the looper effect

Various looper settings can be made.

On the B2 FOUR, one looper can be used as an effect, and it can be started and stopped by turning the effect on/off.

Select the looper effect on the EFFECT Screen to make various looper settings, including loop recording time and volume.

Each patch memory can have only one looper effect set.

  1. Open the EFFECT Screen for the patch memory that will have the looper effect set (→ Opening the EFFECT Screen).
  2. Use and to select the effect to use for the looper effect.

  3. Press / to open the Library Screen, and use , , and to select the looper effect.

    The looper effects are in the second column from the right on the Library Screen. Choose either the MONO LOOPER or the STEREO LOOPER.

    NOTE

    • The recording time for the mono looper is from 1.5 to 60 seconds (30 seconds when UNDO is ON).

    • The recording time for the stereo looper is from 1.5 to 30 seconds (15 seconds when UNDO is ON).

  4. Press .

    This opens the EFFECT Screen.

  5. Turn to adjust the looper effect settings.

    See the reference links for details about the settings.

    Loop recording time
    This sets the recording time for the loop. (→ Setting the recording time)
    Undo function setting
    This turns on/off the undo function that can be used to undo the last recorded overdub of a loop. (→ Setting the UNDO function)
    Stop mode
    This sets how the looper behaves when loop playback is stopped. (→ Setting the stop mode)
    Volume
    This adjusts the looper volume. (→ Adjusting the volume)

Setting the recording time

This sets the recording time for the loop.

  1. Turn on the Looper Effect Setting Screen (→ Setting the looper effect).
    SettingExplanation
    MANUALRecording will continue until stopped manually or the maximum recording time is reached.
    ♩×1–64This sets the value to 1 – 64 quarter notes. The actual recording time depends on the BPM (tempo) setting (→ Adjusting the tempo).

    The recording time (seconds) = 60 ÷ BPM × quarter notes.

    When the set recording time is reached, recording will stop and loop playback will start.

    NOTE

    • The setting options include MANUAL and 1 – 64 quarter notes.

    • The looper recording time is 1.5 – 30 seconds (15 when UNDO is ON) for stereo, and 1.5 – 60 seconds (30 when UNDO is ON) for mono. To switch between stereo and mono, see “Setting the looper effect”.

    • Settings that would exceed the maximum recording time will be adjusted automatically.

    • Changing the recording time will delete the recorded data.

Setting the UNDO function

This turns on/off the undo function that can be used to undo the last recorded overdub of a loop.

  1. Turn on the Looper Effect Setting Screen (→ Setting the looper effect).
    SettingExplanation
    ONThis enables the UNDO function.
    OFFThis disables the UNDO function.
    NOTE

    The looper recording time is 1.5 – 30 seconds (15 when UNDO is ON) for stereo, and 1.5 – 60 seconds (30 when UNDO is ON) for mono. To switch between stereo and mono, see “Setting the looper effect”.

Setting the stop mode

How the looper behaves when stopped can be set.

  1. Turn on the Looper Effect Setting Screen (→ Setting the looper effect).
    SettingExplanation
    INSTANTThe loop will stop immediately after a stop operation.
    FINISHThe loop will stop after playing to its end.
    FADE OUTThe loop will stop playing after fading out.

Adjusting the volume

The looper volume can be adjusted.

  1. Turn on the Looper Effect Setting Screen (→ Setting the looper effect).
    HINT

    This can be set from 0 to 100.

Notes about the looper tempo

  • The looper tempo is also used by effects and rhythms.

  • The tempo can be set as explained in “Adjusting the tempo”.

  • Changing the tempo will erase recorded loops in the following cases.

NOTE

  • If the rhythm pre-count function is on, recording will start after the pre-count. (→ Setting the rhythm effect)

  • Sound input through the AUX IN jack will not be recorded.

HINT

During rhythm playback (→ Using rhythms), quantization is enabled so even if the recording ending time is not exact, the loop will automatically be adjusted so that loop playback stays in time.

Looper operations

Looper recording, playback and other operations can be conducted when the looper effect is shown on the EFFECT Screen.

HINT

  • Looper recording/playback will continue even if is pressed to switch to the MEMORY Screen. In this case, changing patch memories will stop recording/playback and erase the recorded data.

  • Pressing / to open the Library Screen will stop recording/playback.

Recording loops

  1. When a loop has not yet been recorded, press the – footswitch that corresponds to the looper effect ( in this example).

    Recording will start and the indicator will light.

    Press the footswitch with the lit indicator 2 times to cancel recording.

Stopping recording and starting loop playback

  1. When recording, press the – footswitch that corresponds to the looper effect ( in this example).

    Recording will stop and loop playback will start.

    NOTE

    • If the maximum recording time is reached, recording will stop and loop playback will start.

    • If the recording time is set to “♩×1–64”, recording will stop and loop playback will start after the set recording time has elapsed. (→ Setting the recording time)

Stopping playback

  1. During playback, press the – footswitch that corresponds to the looper effect ( in this example) 2 times.

    The indicator becomes unlit when playback stops.

Starting loop playback of the recorded phrase

  1. When stopped, press the – footswitch that corresponds to the looper effect ( in this example).

    The indicator lights when playback starts.

Adding performances to recorded loops (overdubbing)

  1. When playing, press the – footswitch that corresponds to the looper effect ( in this example).

    This starts overdubbing.

    • When the end of the loop is reached, loop playback will continue from the beginning, and overdubbing can be repeated.

    • When overdubbing, press the footswitch with the lit indicator to stop overdubbing, but continue loop playback.

Erasing the last overdubbed phrase (UNDO function)

The UNDO function can be used when it is set to ON. (→ Setting the UNDO function)

  1. During playback, press and hold the – footswitch that corresponds to the looper effect ( in this example).

Clearing loops

  1. When stopped, press and hold the – footswitch that corresponds to the looper effect ( in this example).

    This clears the recorded loop.

Using audio interface functions

The B2 FOUR can be used as a 2-in/2-out audio interface.

After being processed by effects, 2 channels of audio signals can be sent from the B2 FOUR to a computer or smartphone.

From a computer or smartphone, 2 audio signal channels can be input to a position after the effect processing.

See Signal flow for details about input and output positions.

Installing drivers

Windows computers

  1. Download the B2 FOUR Driver from zoomcorp.com to the computer.
    NOTE

    The latest B2 FOUR Driver can be downloaded from the above website.

  2. Launch the installer and follow its instructions to install the B2 FOUR Driver.
    NOTE

    See the Installation Guide included in the driver package for detailed installation procedures.

Mac computers, smartphones and tablets

No driver is necessary for use with a Mac, smartphone or tablet.

Connecting with a computer, smartphone or tablet.

  1. Use a USB cable to connect the B2 FOUR to a computer, smartphone or tablet.
    Smartphone/tablet (Android)
    Smartphone/tablet (iOS/iPadOS)
    Computer (Windows/Mac)
    NOTE

    • Use a USB (Type-C) cable that supports data transfer.

    • Use a Lightning to USB 3 Camera Adapter to connect to an iOS/iPadOS device with a lighting connector.

  2. Set to ON.

    The B2 FOUR will start up and be connected to the smartphone/tablet.

    If connecting to a computer, continue to step 3.

  3. When connecting to a computer, set the B2 FOUR as the sound device.

Operating the B2 FOUR from an iPhone/iPad

The B2 FOUR can be operated from an iPhone/iPad using Handy Guitar Lab for B2 FOUR, an iOS/iPadOS app.

NOTE

The dedicated Handy Guitar Lab for B2 FOUR app must be installed on the iPhone/iPad beforehand. The Handy Guitar Lab for B2 FOUR app can be downloaded from the App Store. For setting and operation procedures using the Handy Guitar Lab for B2 FOUR app, see its operation manual.

  1. Use a USB cable to connect the B2 FOUR and the iPhone/iPad.
    NOTE

    • Use a USB (Type-C) cable that supports data transfer.

    • Use a Lightning to USB 3 Camera Adapter to connect to an iOS/iPadOS device with a lighting connector.

  2. Set to ON.
  3. Launch Handy Guitar Lab for B2 FOUR on the iPhone/iPad.

Making hardware settings

Setting the AUTO SAVE function

When the AUTO SAVE function is ON, patch memories will be saved automatically when their contents are changed.

See “Using the MENU Screen” for details about operation.

  1. Select AUTO SAVE on the MENU Screen.
  2. Press / to turn it ON/OFF.
    SettingExplanation
    ONThis turns on the AUTO SAVE function.
    OFFThis turns off the AUTO SAVE function.
  3. Press .

    This confirms the setting and returns to the MEMORY Screen or EFFECT Screen.

    HINT

    Patch memories will not be saved automatically if the AUTO SAVE function is OFF.

    When the content of a patch memory has been changed, will appear at the top right of the MEMORY Screen, showing that it is different from the saved settings. Save it as necessary. (→ Copying and saving patch memories)

Setting the ECO mode

This function can be used to turn the power off automatically if unused for 10 hours.

See “Using the MENU Screen” for details about operation.

  1. Select ECO on the MENU Screen.
  2. Press / to switch between ON and OFF.
    SettingExplanation
    ONThe power will automatically turn off if unused for 10 hours.
    OFFThis disables ECO mode.
  3. Press .

    This confirms the setting and returns to the MEMORY Screen or EFFECT Screen.

Adjusting the display contrast

The display contrast can be adjusted.

See “Using the MENU Screen” for details about operation.

  1. Select LCD on the MENU Screen.
  2. Use and to adjust the display contrast.

    The setting value is shown on the display.

  3. Press .

    This confirms the setting and returns to the MEMORY Screen or EFFECT Screen.

Managing the firmware

Checking the firmware versions

The firmware versions used by the B2 FOUR can be checked.

See “Using the MENU Screen” for details about operation.

  1. Select VERSION on the MENU Screen.
  2. Check the versions on the Version Screen.

    This shows the firmware and preset versions.

    B2 FOUR firmware version
    Preset version
    BOOT version

Updating

The B2 FOUR firmware can be updated to the latest versions.

The latest firmware can be downloaded from the ZOOM website (zoomcorp.com).

Restoring factory default settings

The factory default settings can be restored.

See “Using the MENU Screen” for details about operation.

  1. Select ALL INIT on the MENU Screen.
  2. Use / to select YES.
  3. Press .

    Initialization will be executed, restoring default settings.

    NOTE

    Initialization will overwrite all settings, including patch memories, to their factory defaults. Be certain before using this function.

    HINT

    To cancel initialization, select NO in step 2.

Appendix

Troubleshooting

The unit will not power on

There is no sound or output is very quiet

There is a lot of noise

  • Confirm that an instrument cable is not the cause.

  • Use a genuine ZOOM AC adapter. (→ Making connections)

An effect cannot be selected

Expression pedal does not work well

Specifications

Maximum number of simultaneous effects5
User patch memories300
A/D conversion24-bit 128× oversampling
D/A conversion24-bit 128× oversampling
Signal processing32-bit
Display256×128 dot-matrix LCD
InputsINPUTStandard mono phone jack

Rated input level: −20 dBu

Input impedance (line): 1 or 10 MΩ (switchable)

AUX INPUTStereo mini jack

Rated input level: −10 dBu

Input impedance (line): 10 kΩ

OutputsLEFT/RIGHTStandard mono phone jacks

Maximum output level: +11.4 dBu (when output impedance 10 kΩ or higher)

BALANCED

OUTPUT

XLR jack

Impedance: 100 Ω (HOT-GND, COLD-GND)/200 Ω (HOT-COLD)

GND LIFT (switchable)

PHONESStereo mini jack

Maximum output power: 33 mW + 33 mW (into 32Ω load)

Input S/N124 dB
Noise floor (residual noise)LEFT/RIGHT–96.0 dBu
BALANCED

OUTPUT

–100.0 dBu
PHONES–96.0 dBu
Control inputFP02M input
PowerAC adapter: 9V DC 500mA center negative (ZOOM AD-16)
USBUSB 2.0 Type-C port (use cable that supports Type-C)

Handy Guitar Lab: USB 1.1 Full Speed

Audio interface: USB 2.0 Full Speed, 32-bit, 2-in/2-out

• Use a USB cable that supports data transfer. USB bus power is supported.

Dimensions146 mm (D) × 249 mm (W) × 72 mm (H)
Weight906 g

Note: 0 dBu = 0.775 V

4-4-3 Kanda-surugadai, Chiyoda-ku, Tokyo 101-0062 Japan
zoomcorp.com
Z2I-4836-01