Thank you, and congratulations on your choice of BOSS DD-20 Digital Delay. Before using this unit, carefully read the sections entitled: USING THE UNIT SAFELY and IMPORTANT NOTES (separate sheet). These sections provide important information concerning the proper operation of the unit. Additionally, in order to feel assured that you have gained a good grasp of every feature provided by your new unit, this manual should be read in its entirety. The manual should be saved and kept on hand as a convenient reference.

Main Features

A full 23-second long delay provides plenty of time for loop play and sound-on-sound. The Memory function allows you to store up to four tones in the DD-20 itself, independent of the panel settings. You also get seamless switching, with memories switched smoothly as the reverberation continues. Features a Delay mode with a total of eleven effects, including new SMOOTH, TWIST and some effects modeled on analog and tape echo effects. The new Time Advance function provides quick, yet sensitive control of delay times. Equipped with custom backlit LCD for clear, easy viewing of delay times, even on dark stages.
Copyright 2003 BOSS CORPORATION All rights reserved. No part of this publication may be reproduced in any form without the written permission of BOSS CORPORATION.

Contents

Main Features.. 1

How to Use Each Mode.21

How to Use SOS (Sound On Sound).21 How to Use TWIST..22 How to Use WARP..22 How to Use TAPE..23 How to Use DUAL..24 How to Use MODULATE.25
Installing Batteries. 3 Making the Connections. 4
Mono Connection. 5 Stereo Connection.. 5 Connecting the Stereo Output and the Effects Processor.. 6 Connecting to SEND/RETURN. 6 With Guitar and Bass Amps. 6 Connecting to an MTR or Mixer. 7
How to Use the Tempo Function.26 Indicating the BPM in the Delay Time Display.27 Settings Made When the Power is Switched ON.28
Global Procedures.28 Changing the Pedal Mode Settings..29 Setting the Output Mode..30 Setting the External Pedal Function.31 Changing How Memory Numbers Are Indicated..33 Returning Settings to Their Factory Defaults...34

Operation. 8

ON/OFF Pedal Operation. 8 Panel Operation.. 9 Storing Settings (Write Operation).. 10 Storing the MANUAL Sound in Memory.. 10 Changing and Storing the MEMORY Sound.. 12 MEMORY/TAP Pedal Operation (Switching Memories). 14 MEMORY/TAP Pedal Operation (Tap Input).. 15
Part Names and Functions 16
Front Panel.. 16 Operating the DELAY TIME Knob.17 MODE List.. 18 Rear Panel... 20
Troubleshooting.35 Sample Settings.37 Setting Memo..40 Specifications..41 Index..42

Installing Batteries

Batteries are supplied with the unit. The life of these batteries may be limited, however, since their primary purpose was to enable testing. Insert the included batteries as shown in figure, being careful to orient the batteries correctly.

fig.02

When turning the unit upside-down, get a bunch of newspapers or magazines, and place them under the four corners or at both ends to prevent damage to the buttons and controls. Also, you should try to orient the unit so no buttons or controls get damaged. When turning the unit upside-down, handle with care to avoid dropping it, or allowing it to fall or tip over. Make sure the + and ends of the batteries are oriented correctly. When the batteries run down, the POWER indicator gets dim. If this happens, replace with new batteries. When replacing the batteries, use six AA type. Avoid using new batteries together with used ones. In addition, avoid mixing different types of batteries. Doing so can result in fluid leakage. Battery life can vary depending on battery type. Continuous usage time under battery power is about 7 hours with alkaline batteries and about 2 hours with carbon batteries. (This may vary according to usage conditions.) 3

Making the Connections

The use of an AC adaptor is recommended as the units power consumption is relatively high. Should you prefer to use batteries, please use the alkaline type. Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience such problems, you should relocate such wireless devices so they are at a greater distance from this unit, or switch them off. Use a cable from Roland to make the connection. If using some other make of connection cable, please note the following precautions. Some connection cables contain resistors. Do not use cables that incorporate resistors for connecting to this unit. The use of such cables can cause the sound level to be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable. When the unit is running on battery power, the power comes on when you insert the connector plug into the INPUT A (MONO) jack. To prevent malfunction and/or damage to speakers or other devices, always turn down the volume, and turn off the power on all devices before making any connections. If there are batteries in the unit while an AC adaptor is being used, normal operation will continue should the line voltage be interrupted (power blackout or power cord disconnection). Once the connections have been completed, turn on power to your various devices in the order specified. By turning on devices in the wrong order, you risk causing malfunction and/or damage to speakers and other devices. When powering up: Turn on the power to your guitar amp last. When powering down: Turn off the power to your guitar amp first. Always make sure to have the volume level turned down before switching on power. Even with the volume all the way down, you may still hear some sound when the power is switched on, but this is normal, and does not indicate a malfunction. When operating on battery power only, the units indicator and backlit LCD will become dim when battery power gets too low. Replace the battery as soon as possible. When moved from one location to another where the temperature and/or humidity is very different, water droplets (condensation) may form inside the unit. Damage or malfunction may result if you attempt to use the unit in this condition. Therefore, before using the unit, you must allow it to stand for several hours, until the condensation has completely evaporated. 4

Mono Connection

fig.03
AC Adaptor PSA-series (option)
Electric Guitar (Electric Bass) Bass Amplifier

or MTR Guitar Amplifier

Stereo Connection

fig.04

Electric Guitar (Electric Bass) Guitar Amplifier (Bass Amplifier)

or MTR

Connecting the Stereo Output and the Effects Processor

fig.05

Effector Electric Guitar (Electric Bass) or
Guitar Amplifier (Bass Amplifier)
Connecting to SEND/RETURN
With Guitar and Bass Amps
* Match the DD-20's level setting and the output level from the guitar or bass amp's SEND output. If there is any distortion in the sound, reduce the level on the connected device. * If the guitar or bass amp's SEND/RETURN level is +4 dBu, switch the setting to +4 dB as described in Setting the Output Mode (p. 30).

Mono Send/Mono Return

fig.06
AC Adaptor PSA-series (option) SEND Electric Guitar (Electric Bass) RETURN Guitar Amplifier (Bass Amplifier)

Mono Send/Stereo Return

fig.06a

SEND RETURN R RETURN L

Electric Guitar (Electric Bass)
Connecting to an MTR or Mixer
When using the DD-20 while connected to the SEND/RETURN of a mixer or multitrack recorder, follow the instructions in Setting the Output Mode (p. 30) to set A: Direct Sound + B: Effect Sound so that only the delay signal is output from the DD-20; the sound is output from the OUTPUT B jack.

fig.07a

AC Adaptor PSA-series (option) SEND RETURN

Operation

Effect On for the pedal setting and MANUAL is selected when the power is turned on.

ON/OFF Pedal Operation

fig.12

When at ON Lit

When at OFF When at WARP or TWIST When at SOS REC or OVERDUB Not lit Blink Blink When at SOS PLAY Lit
Each press of the ON/OFF pedal switches effects on or off. When effects are off, the sound coming in through the INPUT jack is output unchanged.
If the output is set to A:DIR B:EFX, nothing is output from the OUTPUT B jack when the effects are off. Only the effect sound is output from the OUTPUT B jack when the effects are on. This is set at the factory to A:DIR B:EFX. Setting the Output Mode (p. 30)
The pedal functions differently according to the Pedal mode settings.
How to Use Each Mode (p. 21)
The DD-20 features a seamless switching function whereby the reverberation sound decays gradually, even after the effects are switched off.

Panel Operation

In order to follow along with the instructions given here, you should start out by having effects switched ON (press the ON/OFF pedal and confirm that the ON/ OFF indicator has lighted), and press the SELECT button to switch MANUAL (MANUAL indicator has lighted in green). Also set the knobs as shown in the illustration.

fig.17

1. Rotate the MODE knob to select an appropriate delay effect from the eleven available types. 2. Adjust the delay time by rotating the DELAY TIME knob. * Pressing the knob down as you turn it cause the delay time to change more rapidly. Furthermore, the rate at which it changes also varies according to how the knob is turned. More detail, refer to Operating the DELAY TIME Knob (p. 17). 3. Rotate the F. BACK knob to adjust the amount of the feedback. 4. Adjust the tone of the effect sound with the TONE knobs. The frequency response is flat when the knob is at the center position. You can usually leave the knob at the center position. 5. Adjust the volume of the effect sound with the E.LEVEL knob.

fig.12-1

Lit Lit
You can easily set the delay time to match the tempo of the song being played by pressing the pedal in time with the songs tempo (Tap Input). The TEMPO indicator flashes in time with the tempo being input with Tap Input. * You can use the TEMPO button to change the delay time set with Tap Input. Refer to How to Use the Tempo Function (p. 26).

Part Names and Functions

Front Panel

fig.24

F.BACK (feedback) Knob
Adjusts the feedback level (or how much the sound is repeated). * Oscillation may occur with certain input sounds, or when the knob is set at certain positions. * This knob is not functional when SOS is selected as the mode (p. 18).

DELAY TIME Knob

This sets the delay time for the sound. You can turn the knob without pushing it (changing the delay time in 1-msec units) or while pushing it (activating the Time Advance function). Operating the DELAY TIME Knob (p. 17)
E.LEVEL (effect level) Knob
Adjusts the volume of the effect sound.
MEMORY Number Indicators (14)
The indicator for the currently selected MEMORY number (14) lights. The indicator flashes while the DD-20 is in write standby; the indicator flashes more rapidly while the write operation is in progress.

TONE Knob

This adjusts the tone of the effect's sound. The frequency response is flat when the knob is set to the center position; turning it to the right boosts the higher frequencies, and turning it to the left cuts the higher frequencies. * This knob is not functional when SOS is selected as the mode (p. 18).

SELECT Button

This changes MANUAL or memories 14.

WRITE Button

Press this to store settings in MEMORY.

MODE Knob

Select the type of delay effect (p. 18).

TAP Button

The delay time is set according to the intervals between taps of the button. You can switch between the delay time indicator and the BPM indicator by holding down the button for two seconds or longer.

TEMPO Button

This is used to specify the length of the delay time for the tempo input with Tap Input in terms of the note length.
* You can turn the display backlighting on and off by together pressing both the TAP button and the TEMPO button.

TEMPO Indicator

This flashes in time with the beat for the selected tempo.
Operating the DELAY TIME Knob
When adjusting the delay time with the DELAY TIME knob, the setting normally changes in units of one millisecond (or ten milliseconds if the time is ten seconds or longer). However, simultaneously pressing and turning the knob causes the delay time setting to change rapidly, allowing you to quickly reach the value you want, even with higher values. This feature is called the Time Advance function. The settings range for Delay Time is from one millisecond to 23 seconds. When the BPM is indicated (p. 27), the settings range is from 3 to 9999. * The range of the setting varies according to the mode and tempo selected.

SOS (Sound On Sound)

REVERSE

fig.25

DUAL Indicator (SHORT, LONG)
Indicates the delay time as well as the delay (SHORT, LONG) when the DD-20 is set to DUAL mode.

Display

When the power is turned on, the backlighting comes on, then goes off again after approximately twenty seconds. This feature is intended to prevent unnecessary battery drainage. If you want to keep the backlighting on, simultaneously press the TAP button and TEMPO button; the light then stays on. * Remember to check on battery power consumption. * Never strike or apply strong pressure to the display.
Output Mode Indicator (A:EFX, B:DIR, +4dB)
Setting the Output Mode (p. 30)

DELAY TIME

This shows the unit of time for the currently selected delay time (or BPM unit). When MODE is set to SOS, it indicates the remaining memory (%) during recording and the loop phrase position during playback and overdubbing.
Control Pedal Function Indicator (ON/OFF, TAP, MEM)
Setting the External Pedal Function (p. 31)

Tempo Type Indicator ( )

How to Use the Tempo Function (p. 26)

ON/OFF Indicator

This lights up when effects are on.

POWER Indicator

This lights up when the power is on.

ON/OFF Pedal

Each press of the pedal switches the effects on or off. With MODE set to WARP or TWIST, pressing on the pedal produces the corresponding effect.

MEMORY Indicator

This is lit when the MEMORY/TAP pedal is used for switching between MANUAL and memories (14).

MEMORY/TAP Pedal

This pedal performs two functions, as a Memory Pedal used for switching between MANUAL and memories (14), and for Tap Input of the delay time. MEMORY/TAP Pedal Operation (p. 14, 15)

TAP Indicator

This is lit when the MEMORY/TAP pedal is used for Tap Input.

Rear Panel

fig.26
INPUT Jacks (A (MONO), B)
This is the input jack for connecting to the output of an electric guitar or other instrument or effects processor. For MONO use, make the connection to the A (MONO) jack. Making the Connections (p. 4)

PHONES Jack

You can connect headphones here to monitor the sound.
* Turn on the power before you connect headphones. When turning off the power, first unplug the headphones, then switch off the power. * Please observe due caution when using headphones while the Output Mode is set to +4 dB, since their volume may get significantly higher.
* The INPUT A (MONO) jack also doubles as the power switch when the unit is running on battery power. The power comes on when a plug is inserted into the INPUT A (MONO) jack, and goes off when it is unplugged. Unplug any connected cords when the unit is not in use.

AC Adaptor Jack

This jack is for connecting an AC adaptor (BOSS PSA-series, sold separately). Using an AC adaptor makes possible long performances with no worry about batteries going dead.

CTL PEDAL Jack

Connect an external control pedal (the optional BOSS FS-5L/FS-5U) to this jack. You can use the external control pedal to turn the effect on and off, to input the delay time with Tap Input, and to switch memories. Setting the External Pedal Function (p. 31)
OUTPUT Jacks (A (MONO), B)
This jack is for connection to a guitar/bass amp, another effects processor, mixer, MTR, or the like. For MONO use, make the connection to the A (MONO) jack. Making the Connections (p. 4)

How to Use Each Mode

How to Use SOS (Sound On Sound)
1. Turn the MODE knob to SOS. 2. Press the ON/OFF pedal to start recording. Play what is to be used as the basic phrase. The remaining memory is indicated as a percentage in the display.

fig.29

3. Press the ON/OFF pedal again to stop recording. Loop playback of the recorded phrase begins at the same time you press the pedal. The loop time is indicated in the display as shown below. The TEMPO indicator also flashes.

fig.30

4. Overdub another phrase. Sounds are overdubbed during loop playback only while the pedal is held down. Continue to hold the pedal down as you play the phrase you want to record. * If the ON/OFF pedal is held down only for a brief period, loop playback stops, and the recorded phrase is erased. By pressing the MEMORY/TAP pedal during loop playback, you can have the delay applied to the guitar sound as loop playback continues. However, you cannot overdub. To stop loop playback, press the MEMORY/TAP button again (we recommend Pedal Mode 2 or 3).

How to Use TWIST

1. Turn the MODE knob to TWIST. 2. Hold down the ON/OFF pedal. The delay sound starts to oscillate, then the oscillation speeds up as its pitch increases.

fig.32

3. Release the pedal. The oscillating sound begins to fade away, and the normal delay sound returns. This effect works very well with distortion sounds, and combining it with distortion results in an even wilder effect (you can adjust the volume of the oscillating sound with the E.LEVEL knob). Using this for the ending of a song is effective. * You can switch the normal effect on and off by pressing the ON/OFF pedal only briefly.

How to Use WARP

1. Turn the MODE knob to WARP. 2. Hold down the ON/OFF pedal. The feedback level and volume increase.
3. Release the pedal. The effect corresponding to the knob positions (E.LEVEL, F.BACK) resumes. You can create fantastic effects by repeating the warped delay sound and then playing a phrase on top of this. * You can switch the normal effect on and off by pressing the ON/OFF pedal only briefly. 22

How to Use TAPE

You can have either one or two playback heads used for the tape echo effect. Setting this to 2 produces a multi-tap delay effect. 1. Turn the MODE knob to TAPE. 2. Hold down the ON/OFF pedal until HEd1 or HEd2 appears in the display. 3. You can change the number of playback heads used by continuing to hold down the ON/OFF pedal as you turn the DELAY TIME knob. HEd1: One head is used HEd2: Two heads are used

fig.35

* This is set at the factory to HEd1. * This setting is preserved even after the power is turned off. If you want to save it as a setting for the Memories (14), then carry out the Write procedure (p. 10).

How to Use DUAL

Although DUAL mode features a short delay and long delay connected in series, you can change the delay time for the short delay. 1. Turn the MODE knob to DUAL. 2. Hold down the ON/OFF pedal until SHORT appears in the display. In this case, the short delays delay time is indicated.

fig.36

3. You can change the delay time by continuing to hold down the ON/OFF pedal as you turn the DELAY TIME knob. * This is set at the factory to SHORT 50msec, LONG 300 msec. * This setting is preserved even after the power is turned off. If you want to save it as a setting for the Memories (14), then carry out the Write procedure (p. 10).

How to Use MODULATE

You can change the MODULATE modulation rate and depth settings. 1. Turn the MODE knob to MODULATE. 2. Hold down the ON/OFF pedal until r appears in the display. The rate value appears next to the r in the display.

fig.37

3. You can change the rate value by continuing to hold down the ON/OFF pedal as you turn the DELAY TIME knob. 4. Hold down the ON/OFF pedal and turn the DELAY TIME knob to have d displayed. The depth value appears next to the d in the display. * Press the DELAY TIME knob once more to have r displayed.
5. You can change the depth by continuing to hold down the ON/OFF pedal as you turn the DELAY TIME knob. * This is set at the factory to r:80, d:70. * This setting is preserved even after the power is turned off. If you want to save it as a setting for the Memories (14), then carry out the Write procedure (p. 10).

How to Use the Tempo Function
The DD-20 includes a Tempo function, which allows you to specify the delay time in terms of note lengths. The display is switched as shown below each time you press the TEMPO button.

fig.39

(Quarter note)

(Dotted 8th note)

(Quarter note triplet)

(8th note)

(8th note triplet)
(Half note triplet) (Dotted quarter note) (Half note) (Dotted half note) (Whole note)
* Notes for certain delay time settings may not be indicated in the display. * The range of the delay time setting differs according to the tempo selected. The delay sound produced is as shown in the figure.

fig.40

Rhythm Used in Pressing the TAP Pedal or the TAP Button
* If you want to set the delay time to match the timing of the tap input, select Quarter Note.
Indicating the BPM in the Delay Time Display
You can switch the DD-20s time delay display to show the tempo (BPM). If, for example, you already know the BPM of the song you are performing, you can get a perfectly synchronized delay effect by setting the delay time with the indicated tempo (BPM). * Specifying the note lengths with the TEMPO button also makes it easy to specify the times for dotted notes, triplets, and other kinds of notes. 1. Hold down the TAP button until the delay time indicated in the display changes to show the tempo (BPM).

fig.41

Use this same procedure to return to the time (msec) display. When the delay time is saved after switching the display, the method used to display it is also saved.
Settings Made When the Power is Switched ON
You can make the following settings with the operations performed while turning on the power.

fig.42

Returns settings to their factory defaults. Returning Settings to Their Factory Defaults (p. 34)
This sets the pedal mode. Changing the Pedal Mode Settings (p. 29)
WRITE Button + SELECT Button
Set how the Memory numbers are to be indicated.
Setting the External Pedal Function (p. 33)
This sets the output mode. Setting the Output Mode (p. 30)
This sets the External Pedal Function. Setting the External Pedal Function (p. 31)

Global Procedures

Switch off the power.
When running on battery power: Disconnect the connection plug from the INPUT A (MONO) jack. When running on power from an AC adaptor: Disconnect the plug from the INPUT A (MONO) jack and the AC ADAPTOR jack.

Switch on the power.

When running on battery power: Insert the connection plug into the INPUT A (MONO) jack. When running on power from an AC adaptor: Insert the AC ADAPTOR plug into the AC ADAPTOR jack.
Changing the Pedal Mode Settings
Use the following to change the Pedal mode settings. * Pedal mode settings are saved even after the power is turned off. 1. Switch off the power. 2. While holding down the SELECT button, switch on the power. The MEMORY 13 indicator corresponding to the current Pedal mode settings flashes. The Pedal mode is indicated in the display. 3. Set the pedal mode (1-3) pressing the SELECT button.

fig.43

Pedal Mode 1

Pedal Mode 2

Pedal Mode 3
4. Press the WRITE button. After the MEMORY Number indicator begins flashing rapidly, the setting is stored in memory and the unit returns to its ordinary state. * To cancel the setting change and return the unit to its ordinary state, then before you press the WRITE button, operate the MEMORY/TAP or ON/OFF pedal. Pedal Mode 3 ON/OFF Pedal + MEMORY/TAP Pedal Selects from MEMORY 14
ON/OFF Pedal Effect on/off Effect on/off Effect on/off
MEMORY/TAP Pedal Switches MANUAL or MEMORY 14 Switches MANUAL or MEMORY Switches MANUAL or MEMORY
* Only Pedal mode 3 is enabled when the MEMORY/TAP pedal is being used as a Tap Input pedal (when the TAP indicator is lit). * This is set at the factory to Pedal Mode 1. 29

Setting the Output Mode

When using the DD-20 while connected to a guitar or bass amp, mixer, or multitrack recorder SEND/RETURN, you can set the output level (+4 dB) and method of output from the OUTPUT jacks (A: Direct Sound/B: Effect Sound) to match the device connected to the DD-20. 1. Switch off the power. 2. While holding down the ON/OFF pedal, switch on the power. The output mode setting is indicated in the display, and the MEMORY 14 indicator corresponding to the current setting flashes. 3. Set the output mode pressing the SELECT button.

fig.44

Output Mode 1

Output Mode 2

Output Mode 3

Output Mode 4

4. Press the WRITE button. After the MEMORY Number indicator begins flashing rapidly, the setting is stored in memory and the unit returns to its ordinary state. * To cancel the setting change and return the unit to its ordinary state, then before you press the WRITE button, operate the MEMORY/TAP or ON/OFF pedal. Display out1 out2, A:DIR / B:EFX out3, +4dB out4, A:DIR / B:EFX, +4dB Mode Output Stereo output A: Direct Sound/B: Effect Sound Stereo output A: Direct Sound/B: Effect Sound Level -20 dB -20 dB +4 dB +4 dB
* Even when this is set to A: Direct Sound/B: Effect Sound, if the input is in stereo, then the output will also be in stereo. Additionally, if the input is mono while nothing is connected to the OUTPUT B jack (effect sound), then the sounds are not output as A: Direct Sound/B: Effect Sound. If you want to have the output be A: Direct Sound/B: Effect Sound, then set the DD-20 so that A:DIR, B:EFX appears in the display. * This is set at the factory to Output Mode 1. 30
Setting the External Pedal Function
You can connect an optional foot switch (the FS-5U or FS-5L) to the CTL PEDAL jack and use the pedal for turning the effects on and off, for tap input, and for switching memories.

fig.45 Polarity switch

Connection cord (1/4 inch phone type)
Set the polarity switch as shown in the following figure. or
1. Switch off the power. 2. While holding down the MEMORY/TAP pedal, switch on the power. The setting is indicated in the display, and the MEMORY 13 indicator corresponding to the current setting flashes. 3. Set the external pedal function pressing the SELECT button. Each time you press the SELECT button, it switches through the ON/OFF, and TAP, MEM.

fig.46

Settings Made When the Power is Switched ON 4. Press the WRITE button. After the MEMORY Number indicator begins flashing rapidly, the setting is stored in memory and the unit returns to its ordinary state. * To cancel the setting change and return the unit to its ordinary state, then before you press the WRITE button, operate the MEMORY/TAP or ON/OFF pedal. Display ctl1, ON/OFF ctl2, TAP ctl3, MEM Mode CTL1 CTL2 CTL3 Function Switches effects on and off Tap input Switches Memories Foot Switch FS-5L (Latch Type) FS-5U (Momentary Type) FS-5U (Momentary Type)
* This is set at the factory to CTL 2. * When you connect an external pedal after making this setting, the function you have set appears in the display, indicating that the function can be used. When the CTL1 mode is selected and you are using the DD-20 in conjunction with an OD-20, you can turn the DD-20 on and off with the OD-20s AMP CTRL button by connecting the DD-20s CTL PEDAL jack and the OD-20s AMP CTRL jack. When using an external pedal to turn the effect on and off with the DD-20 set to CTL1 mode, if you try to switch the effect on or off with the DD-20s ON/OFF pedal, the external pedals actual function will differ from the function that is indicated. The following parameters cannot be controlled by the external pedal when the external pedal is being used to turn the effect on and off with the DD-20 set to CTL1 mode. Recording, playback, and overdubbing in Sound On Sound (p. 21) TWIST (p. 22) WARP (p. 22) TAPE playback head setting (p. 23) DUAL short delay time setting (p. 24) MODULATE modulation rate setting (p. 25)

Changing How Memory Numbers Are Indicated
Not only can you confirm the currently selected memory merely by checking the lit MEMORY number indicators, you can also change the pattern in which the indicators light up. Select the pattern that provides the easiest way to check the memory in any particular environment. When using the DD-20 in dimly lit surroundings, you can confirm memory numbers more easily by using the Lighting Pattern 2 setting. Lighting Pattern 1 (Normal): Only the indicator for the selected memory lights up (or flashes).

fig.47

MANUAL MANUAL MANUAL MANUAL MANUAL
Lighting Pattern 2: The number of indicators lighting up (or flashing) corresponds to the selected memory number.

fig.48

1. Switch off the power.
2. While holding down the WRITE button and the SELECT button, switch on the power.
3. Press the SELECT button to set the MEMORY indicator lighting pattern.

fig.49

Lighting Pattern 1

Lighting Pattern 2

4. Press the WRITE button. After the MEMORY Number indicator begins flashing rapidly, the setting is stored in memory and the unit returns to its ordinary state. * To cancel the setting change and the unit returns to its ordinary state, then before you press the WRITE button, operate the MANUAL/TAP or ON/OFF pedal. 33
Returning Settings to Their Factory Defaults
You can restore the following settings to their original factory values. Memory 1 (p. 12) Memory Settings Memory 2 (p. 12) Memory 3 (p. 12) Memory 4 (p. 12) MANUAL Delay Time (p. 9) (when the power is switched on) DUAL Short Delay Time (p. 24) MODULATE Rate/Depth (p. 25) TAPE (p. 23) Pedal Mode (p. 29) Output Mode (p. 30) External Pedal Function (p. 31) MEMORY Number Indication (p. 33) SMOOTH TAPE DUAL MODULATE MANUAL: 300 msec S: 50 r: 80, d: 70 HEd1 Mode 1 Mode 1 TAP Lighting Pattern 1
Carrying out the following procedure completely clears the content currently stored in the memories (1-4). 1. Switch off the power. 2. While holding down the WRITE button, switch on the power. The MEMORY Number indicators (1-4) flash.

fig.50

3. Press the WRITE button. After the MEMORY Number indicators (1-4) begin flashing rapidly, the setting is stored in memory and the unit returns to its ordinary state. * To cancel the setting change and the unit returns to its ordinary state, then before you press the WRITE button, operate the MEMORY/TAP or ON/OFF pedal.

Troubleshooting

The power doesnt come on.
Is the guitar connected correctly to the INPUT A (MONO) jack? Check the connections again (p. 4p. 7). * When running off batteries, the unit wont switch on unless theres something plugged into the INPUT jack. This helps conserve the batteries. Is the plug connected to the INPUT B jack? When using battery power, connect the plug to the INPUT A (MONO) jack. Have the batteries run down? Replace with fresh batteries (p. 3). Is the specified AC adaptor (PSA-series sold separately) connected correctly? Check the connections again (p. 4p. 7).

Sound is distorted.

Are the TONE knob positioned correctly? Sounds may become distorted with the knob at certain settings. Turn down this knob, or turn down the E.LEVEL knob to appropriate level. If in spite of these measures the sound is still distorted, lower the output level of the device connected to the INPUT jacks, or set the Output Mode to +4 dB (p. 30).
Pressing the MEMORY/TAP pedal does not call up the intended memory.
Is the proper Pedal mode set for your current application? The MEMORY/TAP pedal (or the MEMORY/ TAP pedal when pressed simultaneously with ON/OFF pedal) functions differently according to the Pedal mode settings. Use the most appropriate setting for your particular application (p. 29). Is the MEMORY/TAP pedal set to the TAP function? If the MEMORY/TAP pedal is set to TAP (MEMORY/TAP pedal has been pressed for two seconds), the pedal functions as a Tap Input pedal. To switch memories, either change the pedal to the MEMORY switching function by holding down the MEMORY/TAP pedal for two seconds, or use an external pedal (p. 14p. 15).

There is no sound.

Is the other equipment connected correctly? Check the connections again (p. 4p. 7). Is the volume turned down on the connected guitar/bass amp, effects processor, or other device? Check the settings on the connected equipment (p. 4p. 7). Is the Output Mode set correctly? Set the Output Mode to match the connected equipment (p. 30). Is the Output Mode set to A: DIR / B: EFX? No sound is output from the OUTPUT B jack when the ON/ OFF pedal is set to OFF. Set the Output Mode to Stereo output (out 1 or out 3) (p. 30).
The volume level of the instrument connected to INPUT jack is too low.
Could you be using a connection cable that contains a resistor? Use a connection cable that does not contain a resistor.
Is the effect level (E. LEVEL knob) set to minimum?
Operate the E.LEVEL knob to adjust the effect level (p. 16).
Pressing the ON/OFF pedal does not switch on or off as intended.