Zoom B3n Service Manual

OPERATION MANUAL

Thank you very much for purchasing the ZOOM .

Please read this manual carefully to learn about all the functions of the so that you

will be able to use it fully.

Keep this manual in a convenient place for reference when necessary.

Contents

Usage and safety precautions …………… 2

Introduction ………………………………… 3

Terms used in this manual ………………… 3

Part names ………………………………… 4

Turning the power on ……………………… 6

Display information ………………………… 7

Adjusting effects …………………………… 8

Using patches ……………………………… 16

Adjusting the master level ………………… 22

Changing various settings ………………… 23

Using the tuner ……………………………… 28

Using rhythms ……………………………… 34

Using the looper …………………………… 36

Using the pedal ……………………………… 41

Using the tap tempo function …………… 42

Restoring default settings and patches …… 43

Updating the firmware ……………………… 44

Troubleshooting …………………………… 46

Rhythm List ………………………………… 46

Specifications ……………………………… 47

© 2016 ZOOM CORPORATION

Copying or reproduction of this Operation Manual in part or in whole without permission is prohibited.

Usage and safety precautions

Warning

Caution

Safety Precautions Usage Precautions

In this manual, symbols are used to highlight warnings
and cautions that you must read to prevent accidents. The
meanings of these symbols are as follows:

Something that could cause serious injury
or death.

Something that could cause injury or
damage to the equipment.

Other symbols

Required (mandatory) actions

Prohibited actions

Warning

Operation using an AC adapter

Use only a ZOOM AD-16 AC adapter with this unit.

Do not do anything that could exceed the ratings of outlets and
other electrical wiring equipment.

Alterations

Never open the case or attempt to modify the product.

Precautions

Product handling

Do not drop, bump or apply excessive force to the unit.

Be careful not to allow foreign objects or liquids to enter the unit.

Interference with other electrical equipment

In consideration of safety, the has been designed to
minimize the emission of electromagnetic radiation from the
device and to minimize external electromagnetic interference.
However, equipment that is very susceptible to interference
or that emits powerful electromagnetic waves could result in
interference if placed nearby. If this occurs, place the
and the other device farther apart.
With any type of electronic device that uses digital control,
including the
cause malfunction, corrupt or destroy data and result in other
unexpected trouble. Always use caution.

Cleaning

Use a soft cloth to clean the panels of the unit if they become
dirty. If necessary, use a damp cloth that has been wrung out
well. Never use abrasive cleansers, wax or solvents, including
alcohol, benzene and paint thinner.

Malfunction

If the unit becomes broken or malfunctions, immediately
disconnect the AC adapter, turn the power OFF and disconnect
other cables. Contact the store where you bought the unit or
ZOOM service with the following information: product model,
serial number and specific symptoms of failure or malfunction,
along with your name, address and telephone number.

, electromagnetic interference could

Operating environment

Do not use in extremely high or low temperatures.

Do not use near heaters, stoves and other heat sources.

Do not use in very high humidity or near splashing water.

Do not use in places with excessive vibrations.

Do not use in places with excessive dust or sand.

AC adapter handling

When disconnecting the AC adapter from an outlet, always pull the
body of the adapter itself.

During lightning storms or when not using the unit, disconnect the
power plug from the AC outlet.

Connecting cables with input and output
jacks

Always turn the power OFF for all equipment before connecting any
cables.

Always disconnect all connection cables and the AC adapter before
moving the unit.

Volume

Do not use the product at a loud volume for a long period of time.

FCC regulation warning (for U.S.A.)

Note: This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from

•
that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

For EU Countries

Declaration of Conformity

2

Introduction

More advanced user interface

We have made the stompbox-style user interface developed for our G series even more

advanced. Using the three displays, you can easily check effect parameters and effect

chains.

Detailed emulations of amp and cabinet characteristics

The delivers studio-quality sound with precise emulations of circuit operations and

bass amp characteristics along with cabinets modeled using impulse responses.

Download new effects and patches

Our free Effects/Patch Manager software for Windows and MacOS allows you to

regularly download new effects and patches created by ZOOM. For detailed information, see

the ZOOM website (http://www.zoom.co.jp/downloads/).

Terms used in this manual

Patch

The can store up to 150 patches with effect parameter settings and ON/OFF states.

Bank

A set of three patches is called a "bank".

Unit

Each "Unit" combines a Display, 4 parameter knobs and a foot switch.

Large effect

An effect that uses multiple units is called a "large effect".

* A printed list of effect parameters is not included with the

Please download a copy from the ZOOM website. ¦ http://www.zoom.co.jp/

3

.

Part names

BANK/SCROLL switches

Control knob/enter key

Dedicated AC adapter (AD-16)

CONTROL IN jack

OUTPUT jacks

Portable music player, etc.

Front panel

Display

Parameter knobs

(In explanations,

these will be

shown like this:

TYPE keys

Footswitches FS1‒FS3

Part names

MENU key

Mode switch

Rear panel

Bass Guitar

AUX IN jackINPUT jack

PHONES jack

Headphones

USB port

Bass Guitar amp

Monitor speakers

Computer

POWER switch

DC 9 V AC adapter
connector

4 5

Turning the power on

To turn the power on

• Lower the amplifier's volume all the way.

• Connect the AC adapter before setting the POWER switch to ON.

• Turn the power of your guitar amplifier or PA system on and raise its volume.

HINT

The starts up in the mode used when the POWER switch was last turned OFF.

Using the eco setting

When eco mode is ON, the will automatically turn off if it is not used

for 10 hours.

6

Display information

Display in STOMP mode

In STOMP mode, you can turn effects ON/OFF and change effect types.

Standard effect

Parameter names

Parameter values

Large effect

Parameter

names

Switching display contents

Press to switch between showing parameters and effect names.

Parameter values

Display in MEMORY mode

In MEMORY mode, you can change patches and banks.

Patch number Patch name

Showing the effects used in a patch

Press to show the effects used in a patch.

When the effects are shown, turn

Press again to return to the original screen.

to scroll through the effects.

7

Adjusting effects

Press to change to STOMP mode.

Turning effects ON/OFF

• Press .

• This turns that effect ON/OFF.

[OFF] [ON]

NOTE

Some large effects have SOLO or other special functions assigned to .

The parameter function assigned to is shown on the Display with white letters on a dark

background.

Ordinary
ON/OFF

Selecting effect types

• Press .

• This changes the effect type.

SOLO ON/

OFF

8

Adjusting effects

NOTE

The allows you to combine up to 7 effects in whatever order you like. If limits on the processing
capability or the number of units used are exceeded, a "PROCESS OVERFLOW" warning will appear and
effects will be bypassed. To end bypassing, delete some effects or change their types.

Selecting effect categories

• While pressing and holding , press .

• The category name will appear and the effect will be changed to the first
effect type in the category.

Æ Æ …

HINT

While pressing and holding , press to change effect categories in reverse order.

… Å Å

9

Adjusting effects

Adjusting parameters

• Turn , , and .

HINT

• Parameter adjustments are saved automatically.

• When AUTO SAVE is set to OFF, a parameter saving screen will appear when you try to change patches.
(¦P19)

NOTE

Set Time, Rate and other effect parameters to musical notes to sync them to the tempo. (¦P42)

Scrolling effect displays

• Use and to scroll the screen.

• Press or .

10

• Press repeatedly to scroll the effect displays.

È

• Press .

Adding effects

• Press to open the MENU screen.

• Turn to select ADD.

Adjusting effects

NOTE

If 7 effects are already in use, ADD will not be shown.

• Press to open the ADD screen.

11

Adjusting effects

• Turn to select where the effect will be added.

• Press to confirm where the effect is added.

• A cable will be added to the Display.

• Press to select the effect type.

12

Deleting effects

• Press to open the MENU screen.

• Turn to select DELETE.

• Press to open the DELETE screen.

• Turn to select the effect to delete.

Adjusting effects

• Press .

• Press to delete the effect.

HINT

Turn to cancel deletion.

13

Adjusting effects

• Press .

Changing the effect order

• Press to open the MENU screen.

• Turn to select CHAIN.

• Press to open the CHAIN screen.

• Turn to select the effect to swap.

• Press to confirm the effect to swap.

14

• Turn to swap with the next effect in the chain.

• Press .

Adjusting effects

15

Using patches

Press to switch to MEMORY mode.

Selecting patches

 Switching patches

• Press , or .

• This changes the patch.

NOTE

The selected patch has a white background.

 Switching banks

• Use and .

• This changes the bank.

È

NOTE

• Press and hold , to change banks continuously.

• See P24 for information about the preselect function that enables changing to banks with distant numbers.

16

Setting independent patch parameters

 Entering patch setting mode

• Press to open the MENU screen.

• Turn to select PATCH.

Using patches

• Press

to open the PATCH screen.

 Adjusting patch levels

• Turn to select LEVEL.

• Press .

• Turn to set the patch level.

17

Using patches

NOTE

The setting range is 0–120.

• Press to confirm the patch level.

 Changing patch names

• Turn to select the character to change.

• Press to confirm the character to change.

• Turn to change the character.

• Press to confirm the changed character.

NOTE

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

! # $ % & ' () +, -. ; = @ [] ^ _ ` { } ~, (space) A–Z, a–z, 0–9

• Press and hold

to change the character type.

18

 Ending patch setting mode

• Press .

Saving patches

• Press to open the MENU screen.

• Turn to select SAVE.

• Press to open the SAVE screen.

Using patches

• Turn to select where the patch will be saved.

• Press to confirm where the patch will be saved.

• Turn to select YES.

19

Using patches

HINT

Select NO to cancel saving the patch.

• Press to save the patch.

Swapping patches

• Press to open the MENU screen.

• Turn to select SWAP.

• Press to open the SWAP screen.

• Turn to select the patch to be swapped.

• Press to confirm the patch to be swapped.

20

• Turn to select YES.

HINT

Select NO to cancel swapping.

• Press to swap the patches.

Using patches

21

Adjusting the master level

• Press to open the MENU screen.

• Turn to select M.LVL.

• Press to open the MASTER LEVEL screen.

• Turn to adjust the master level.

NOTE

The setting range is 0–120.

HINT

You can also turn to adjust the master level in both STOMP and MEMORY modes.

22

Changing various settings

Change various settings on the SETUP screen.

Opening the SETUP screen

• Press to open the MENU screen.

• Turn to select SETUP.

• Press to open the SETUP screen.

23

Changing various settings

Setting the preselect function

Turn PRESELECT ON to enter standby when the bank is switched, allowing you to
press a foot switch to confirm the patch change.

• On the SETUP screen, turn

• Press .

• Turn to set PRESELECT to ON/OFF.

• Press to confirm the preselect setting.

to select PRESELECT.

24

Changing various settings

Setting the eco mode

When eco mode is on, the will automatically turn off if not used for 10
hours.

• On the SETUP screen, turn

• Press .

• Turn to set eco to ON/OFF.

• Press to confirm the eco mode setting.

to select eco.

25

Changing various settings

Setting the auto save function

Enable parameters to be saved automatically.

• On the SETUP screen, turn

to select AUTO SAVE.

• Press .

• Turn to set AUTO SAVE to ON/OFF.

NOTE

When set to OFF, no patch or effect parameters will be saved automatically.

• Press to confirm the auto save setting.

Note about switching patches

When AUTO SAVE is set to OFF, if you try to switch patches after changing any parameters, a
message will appear asking to save the parameter changes.
To save changes to parameters before switching patches, select YES. (¦P19)
To discard changes to parameters before switching patches, select NO.

26

Changing various settings

Adjusting the display contrast

• On the SETUP screen, turn to select LCD CNTRST.

• Press .

• Turn to select a display to adjust its contrast.

• Press to confirm the display.

• Turn to adjust the contrast.

NOTE

The setting range is 1–13.

• Press to confirm the contrast setting.

27

Using the tuner

Activating the tuner

• Press and hold in STOMP or MEMORY mode.

• Press or .

(Press

The BYPASS sound is output when the TUNER is active.

(Press

No sound is output when the TUNER is active.

• This opens the TUNER screen.

)

)

28

Tuning a bass guitar

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

Chromatic tuner

The name of the nearest note and the pitch accuracy are shown.

Flat Correct pitch Sharp

¥

Other tuners

The number of the nearest string and the pitch accuracy are shown.

Flat Correct pitch Sharp

¥

Closing the tuner

Using the tuner

¦

¦

• Press when the TUNER screen is open.

29

Using the tuner

Changing the tuner settings

 Opening the TUNER SETTINGS screen

• Press to open the MENU screen.

• Turn to select TUNER.

• Press to open the TUNER SETTINGS screen.

30

Using the tuner

 Changing the standard pitch of the tuner

• On the TUNER SETTINGS screen, turn to select CALIBRATION.

• Press .

• Turn to change the standard pitch.

NOTE

The setting range is 435–445 Hz for middle A.

• Press to confirm the standard pitch of the tuner.

HINT

You can also turn the center unit when the TUNER screen is open to change the standard pitch.

31

Using the tuner

 Changing the tuner type

• On the TUNER SETTINGS screen, turn to select TYPE.

• Press .

• Turn to select the tuner type.

CHROMATIC

The chromatic tuner shows the nearest pitch name (semitone) and how far the input sound is from
that pitch.

Tuner type

Display Meaning

BASS Standard tuning for bass guitars, including those with 5 or 6 strings B E A D G C

String number/Note name

LB 4 3 2 1 HC

HINT

”LB” is the low B string and ”HC” is the high C string.

• Press to confirm the tuner type.

32

 Using flat tuning

• On the TUNER SETTINGS screen, turn to select FLAT.

• Press .

• Turn to change the flat tuning.

NOTE

• You can drop the tuning by one ( x 1), two ( x 2) or three ( x 3) semitones.

• Drop tuning is not possible when the TYPE is set to CHROMATIC.

Using the tuner

• Press to confirm the flat tuning setting.

33

Using rhythms

Selecting a rhythm

• Press to change to STOMP mode.

• Use to select RHYTHM for the desired unit.

NOTE

One RHYTHM can be selected per patch.

Playing a rhythm

• Press

• The rhythm starts playing.

for the unit using the rhythm effect.

HINT

• During rhythm playback, you can switch between STOMP and MEMORY modes.

• If you change a patch during rhythm playback, the rhythm will stop.

Stopping a rhythm

• During rhythm playback, press

• The rhythm stops.

for the unit using the rhythm.

34

Setting rhythms

 Selecting rhythm patterns

• Turn for the unit using the rhythm.

NOTE

See P46 for information about the patterns.

 Adjusting the rhythm tempo

• Turn for the unit using the rhythm.

NOTE

• The setting range is 40–250 bpm.

• This tempo setting is used by every effect, rhythms and the looper.

Using rhythms

 Adjusting the rhythm volume

• Turn for the unit using the rhythm.

NOTE

The setting range is 0–100.

35

Using the looper

Selecting the looper

• Press to change to STOMP mode.

• Use to select a LOOPER for the desired unit.

1-unit looper

2-unit looper

NOTE

• There are 4 types of loopers: 1-unit mono, 2-unit mono, 1-unit stereo and 2-unit stereo.

• One LOOPER can be selected per patch.

Recording, playing and clearing phrases

 Recording phrases

• Press

• This starts recording.

for the first unit in the LOOPER.

36

Using the looper

• Recording stops and loop playback starts.

If the recording time is set to "MANUAL"

Loop playback will start when you press
reached.

again or when the maximum recording time is

If the recording time is set to a musical note

Loop playback will start when the set recording time is reached.

HINT

• See P39 for how to set the LOOPER recording time.

• During phrase recording and playback, switching to MEMORY mode will not interrupt it.

NOTE

• During rhythm playback, recording will start after the precount.

• Changing a patch will stop phrase recording and playback. Moreover, this will delete the phrase recording
data.

• During rhythm playback, 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.

• Changing the tempo of a RHYTHM during loop playback will erase the recorded phrase.

 Overdubbing a recorded phrase

• During loop playback, press

 Stopping loop playback

With 1-unit looper

• During loop playback, press

• This stops the playback.

for the first unit in the LOOPER.

twice for the unit using the looper.

37

Using the looper

With 2-unit looper

• During loop playback, press

• This stops the playback.

for the second unit in the LOOPER.

 Deleting phrases

With 1-unit looper

• When loop playback is stopped, press and hold
the looper.

• This deletes the phrase.

for the unit using

With 2-unit looper

• When loop playback is stopped, press

LOOPER.

• This deletes the phrase.

38

for the second unit in the

Setting the looper

 Setting the looper recording time

• Turn for the unit using the looper.

NOTE

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

• The recording time for the mono looper is from 1.5 to 80 seconds (40 seconds when UNDO is ON).

• The recording time for the stereo looper is from 1.5 to 40 seconds (20 seconds when UNDO is ON).

• Settings that will not fit in the recording time will be adjusted automatically.

• Changing the recording time will delete the recorded data.

 Setting the UNDO function

• Turn for the unit using the looper to set it to ON/OFF.

Using the looper

NOTE

When UNDO is ON, the recording time will become as follows.

• Mono looper: 40 seconds

• Stereo looper: 20 seconds

Using the UNDO and REDO functions

If UNDO is ON, you can undo the last overdub. You can also use the REDO function to restore the
phrase that the UNDO function deleted.

With 1-unit looper
To undo an overdub, press

for one second again.

With 2-unit looper
To undo an overdub, press
press

twice again.

for one second during playback. To restore the deleted phrase, press

for the first unit twice during playback. To restore the deleted phrase,

39

Using the looper

 Setting how loop playback stops

• Turn for the unit using the looper.

STOP

Stop playback immediately.

FINISH

Play to the end and then stop.

FADE OUT

Stop after fading out.

 Adjusting the looper volume

• Turn for the unit using the looper.

NOTE

The setting range is 0–100.

40

Using the pedal

Using a connected pedal

 Setting up the connected pedal

You can set a pedal effect to be assigned to the connected pedal.

• Press

• Turn to select EX PDL.

• Press to open the EXT PEDAL screen.

• Turn to turn the connected pedal ON/OFF.

HINT

When EXT PEDAL is ON, you can use a pedal effect.

to open the MENU screen.

41

Using the tap tempo function

Loopers, rhythms, delays and some modulation effects can be synchronized to the
tempo.
To synchronize, first select an effect that has a parameter
that can be synchronized and set that parameter (Time or
Rate, for example) to a note value (

Enabling tap tempo

• Press and hold in STOMP or MEMORY mode.

• Press to open the TAP TEMPO screen.

or ).

Setting the tempo

• Press at least twice at the desired tempo.

• This sets the tempo.

HINT

You can also turn for the center unit to adjust the tempo.

42

Using the tap tempo function / Restoring default settings and patches

Ending tap tempo setting

• Press when the TAP TEMPO screen is open.

Restoring default settings and patches

• While pressing

• Turn to select YES.

HINT

Select NO to cancel initialization.

• Press to initialize.

• "Complete!" will appear on the display when initializing completes.

HINT

Executing the All Initialize function will restore all the settings of the , including its patches, to
factory defaults. Do not use this function unless you are certain that you want to do this.

, set the POWER switch to ON.

43

Updating the firmware

Checking the firmware version

• Press to open the MENU screen.

• Turn to select VER.

• Press and check the version.

44

Updating the firmware

 To download the latest firmware

Visit the ZOOM Website (http://www.zoom.co.jp/).

• Connect the

to a computer using a USB cable.

Updating the firmware

• While pressing both

and

, set the POWER switch to ON.

• Launch the version update application on your computer, and execute the
update.

NOTE

Do not disconnect the USB cable during the
update.

HINT

See the ZOOM website for instructions about
how to use the application.

• "Complete!" will appear on the display when updating completes.

• Set the POWER switch to OFF.

HINT

Updating the firmware version will not erase
saved patches.

45

Troubleshooting

No sound or very low volume

• Confirm that the POWER switch is set to

“O N ”.

• Check the connections (¦P4– 5).

• Adjust the patch level (¦P17 ).

• Adjust the master level (¦P22).

• If you are using the expression pedal

to adjust the volume, adjust the pedal

position until the volume level is suitable.

There is a lot of noise

• Check shielded cables for defects.

• Use only a genuine ZOOM AC adapter.

Rhythm List

No. PatternName TimSig

1 GUIDE 4/4

2 8Beats1 4/4

3 8Beats2 4/4

4 8Beats3 4/4

5 16Beats1 4/4

6 16Beats2 4/4

7 16Beats3 4/4

8 Rock1 4/4

9 Rock2 4/4

10 Rock3 4/4

11 ROCKABLY 4/4

12 R'n'R 4/4

13 HardRock 4/4

14 HeavyMtl 4/4

15 MtlCore 4/4

16 Punk 4/4

17 FastPunk 4/4

18 Emo 4/4

19 TomTomBt 4/4

20 Funk1 4/4

21 Funk2 4/4

22 FunkRock 4/4

23 JazzFunk 4/4

No. PatternName TimSig

24 R&B1 4/4

25 R&B2 4/4

26 70s Soul 4/4

27 90s Soul 4/4

28 Motown 4/4

29 HipHop 4/4

30 Disco 4/4

31 Po p 4/4

32 PopRock 4/4

33 IndiePop 4/4

34 EuroPop 4/4

35 NewWave 4/4

36 OneDrop 4/4

37 Steppers 4/4

38 Rockers 4/4

39 Ska 4/4

40 2nd Line 4/4

41 Country 4/4

42 Shuffle1 4/4

43 Shuffle2 4/4

44 Blues1 4/4

45 Blues2 4/4

46 Jazz1 4/4

An effect is not working

• If limits on effect processing capacity,

the number of units or the amount of

resources used are exceeded, effects will

be bypassed and the following message

will appear (¦P9).

PROCESS OVERFLOW

Expression pedal does not work well

• Confirm the setting of the connected

pedal (¦P41).

No. PatternName TimSig

47 Jazz2 4/4

48 Fusion 4/4

49 Swing1 4/4

50 Swing2 4/4

51 Bossa1 4/4

52 Bossa2 4/4

53 Samba1 4/4

54 Samba2 4/4

55 Breaks1 4/4

56 Breaks2 4/4

57 Breaks3 4/4

58 12/8 Grv 12/8

59 Waltz 3/4

60 JzWaltz1 3/4

61 JzWaltz2 3/4

62 CtWaltz1 3/4

63 CtWaltz2 3/4

64 5/4 Gr v 5/4

65 Metro3 3/4

66 Metro4 4/4

67 Metro5 5/4

68 Metro

46

Specifications

Effect types 80 types

Number of simultaneous
effects

Number of user patches 150

Sampling frequency 44.1 kHz

A/D conversion 24-bit with 128x oversampling

D/A conversion 24-bit with 128x oversampling

Signal processing 32-bit

Frequency characteristics 20-20 kHz +1 dB, -3 dB (10 kΩ load)

Display 128×32 dot-matrix LCDs (3)

Input INPUT Standard monaural phone jack

AUX IN Stereo mini jack

Output R Standard monaural phone jack

L/MONO/PHONES Standard stereo phone jack (combined line/headphone)

Equivalent input noise 119 dBu

Noise floor (residual noise) –100 dBu

Control input FP02 input

Power AC adapter DC 9 V (center minus plug), 500 mA (ZOOM AD-16)

Dimensions

USB USB MIDI USB Micro-B

Weight

Options FP02 expression pedal

•

0 dBm=0.775 Vrms

7

Rated input level: -20 dBu
Input impedance(line) : 470 kΩ

Rated input level: -10 dBu
Input impedance(line) : 10 kΩ

Maximum output level:
+5 dBm (with output load impedance of 10 kΩ or more)

Maximum output level:
Line +5 dBm (with output load impedance of 10 kΩ or more)
Headphones 15 mW +15 mW (into 32 Ω load)

181 mm(D) X 234 mm(W) X 58 mm(H)

1.28 kg

47

ZOOM CORPORATION

4-4-3 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062 Japan

http://www.zoom.co.jp

Z2I-2783-01