Dd250

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 yournew 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 memoriesswitched 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 BOSSCORPORATION 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 UseTAPE..................................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 EffectsProcessor...................................... 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 .....29Setting 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 PanelOperation....................................... 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

PartNames 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......................41Index.....................................42

2

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...