Boss Audio Processor SL-20 Owner's Manual
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Boss Audio Processor SL-20 Owner's Manual

Audio pattern processor
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Thank you, and congratulations on your choice of the BOSS SL-20 Audio Pattern Processor.
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 understanding 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

● Continuously cuts input audio sounds and create a wide variety of slice patterns.
● Includes a "HARMONIC" slice pattern that produces melodies from the chords you play.
This feature provides you with a new way to express your musical ideas.
● Includes a recording function. You can record up to forty seconds of the phrases you play,
then play these back with loop playback. This lets you enjoy performing solos backed by
your recorded phrases.
● The SL-20 is equipped with a MIDI IN connector, allowing you to synchronize tempos with
external MIDI devices.
● The unit provides six different types of stereo effects, including three-dimensional sound
field effects, which are available when the SL-20 is used in stereo output.
● An expression pedal (optional) can be connected and used for hands-free control of the
direct level, effects level, and other parameters.
● The TEMPO indicator provides a clear confirmation of the current tempo, even on dimly lit stages.
Copyright © 2008 BOSS CORPORATION
All rights reserved. No part of this publication may be reproduced in
any form without the written permission of BOSS CORPORATION.

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  • Page 1: Main Features

    Thank you, and congratulations on your choice of the BOSS SL-20 Audio Pattern Processor. 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 understanding of every feature provided by your new unit, this manual should be read in its entirety.

  • Page 2: Table Of Contents

    Contents Main Features ...1 Panel Descriptions ...3 Front Panel ... 3 Rear Panel... 5 Installing Batteries...6 Making the Connections ...7 Mono Input Connection... 8 Stereo Input Connection ... 9 Operating the SL-20 ...10 Basic Operation ... 10 Panel Operation... 11 Setting the Tempo...

  • Page 3: Panel Descriptions

    Panel Descriptions Front Panel BANK Knob Turn to switch the slice pattern variation. EFFECT LEVEL Knob Adjusts the volume of the effect sound. The volume of the effect sound increases as the knob is turned to the right. DIRECT LEVEL Knob Adjusts the volume of the direct sound when the effect is on.
  • Page 4 Panel Descriptions POWER Indicator This indicator shows whether the power is on or off, and also functions as a battery-check indicator. * When the indicator starts to dim or fails to light, the batteries are exhausted. When this occurs, install new batteries.

  • Page 5: Rear Panel

    Once connected, the pedal can be used to control the direct level and effect level in real time. * Use only the specified expression pedal (such as the Roland EV-5; optional). By connecting any other expression pedals, you risk causing malfunction and/or damage to the unit.

  • Page 6: Installing Batteries

    Installing Batteries Insert the batteries as shown below, being careful to orient the batteries correctly. fig.010 • 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 knobs.

  • Page 7: Making The Connections

    Making the Connections • When using an AC adaptor, be sure to use only the specified type (PSA series; optional). Using an adaptor other than the specified type may cause the unit to malfunction, or cause damage to the unit. •...

  • Page 8: Mono Input Connection

    Making the Connections Mono Input Connection ■ Guitar or Bass fig.020 Guitar (Bass) This works well when used in combination with distortion and modulation effects processors. ■ Keyboard fig.030 Keyboard AC Adaptor PSA series (optional) Guitar Amp (Bass Amp) AC Adaptor PSA series (optional) Mixer...

  • Page 9: Stereo Input Connection

    Stereo Input Connection ■ Guitar or Bass fig.060 Effector ■ Keyboard fig.070 Keyboard Guitar (Bass) Making the Connections AC Adaptor PSA series (optional) Guitar Amp (Bass Amp) AC Adaptor PSA series (optional) Mixer...

  • Page 10: Operating The Sl-20

    Operating the SL-20 Basic Operation 1. Set the knobs as shown in the figure above. 2. Press the START/STOP pedal indicator lights). 3. Turn the EFFECT LEVEL knob 4. Turn the TEMPO knob * You cannot set the tempo with the SL-20 while MIDI clock is being received. 5.

  • Page 11: Panel Operation

    Panel Operation Setting the Tempo Turn the TEMPO knob increase the tempo; to slow the tempo down, turn the knob to the left. You can adjust the tempo more precisely by turning the knob slowly. * The tempo setting is stored in memory. * You cannot set the tempo with the SL-20 while MIDI clock is being received.

  • Page 12: Using The Tap Pedal To Cue The Slice Pattern

    Operating the SL-20 Using the TAP Pedal to Cue the Slice Pattern You can jump back to the beginning of the current slice pattern by pressing the TAP pedal while the TAP indicator is off. * The slice pattern is not played when the effect is switched off. Setting the Tempo with the TAP Pedal You can set the tempo for the slice pattern by pressing the TAP pedal in time with the tempo.

  • Page 13: Recording/Loop Playback

    Recording/Loop Playback The SL-20 lets you record up to forty seconds of sounds played with slice patterns. After the recording is completed, loop playback of the sound begins. This allows you to perform with backing from the recorded sound. * You cannot record while the pedal mode (p. 3) is set to MOMENTARY. * Recorded phrase lengths are automatically adjusted to measure units.
  • Page 14 Operating the SL-20 3. Press the START/STOP pedal to stop recording. The PLAY indicator lights up; loop playback of the recorded phrase begins. * Pressing the TAP pedal during loop playback of a phrase causes the SL-20 to return the phrase to the beginning and play it back from that point.

  • Page 15: Controlling Functions With An Expression Pedal

    Controlling Functions with an Expression Pedal You can connect an expression pedal (such as the Roland EV-5; optional) to the EXP jack and use the pedal to control a variety of functions. Function Direct Level Controls the volume of the direct sound when the effect is on.

  • Page 16: Setting The Tempo Response When Slice Patterns Are Switched

    Operating the SL-20 Setting the Tempo Response When Slice Patterns Are Switched When switching slice patterns, you can have all the patterns play at a set tempo, without the tempos switching to the ones set in each individual pattern. 1. While holding down the PEDAL MODE button, turn on the power to the SL-20. The upper part of the TEMPO indicator lights in green.

  • Page 17: Setting The Output Mode

    Setting the Output Mode You can have the output mode stereo effect (p. 3) applied to the direct sound when the effect is switched on. 1. While holding down the PEDAL MODE button, turn on the power to the SL-20. The upper part of the TEMPO indicator lights in green.

  • Page 18: Synchronizing Performances With External Midi Devices

    Operating the SL-20 Synchronizing Performances with External MIDI Devices MIDI (Musical Instrument Digital Interface) is a universal standard that allows for the exchange of performance data and other information among electronic musical instruments and computers. Once MIDI cables are used to connect together devices equipped with MIDI connectors, each device can send data to, or receive data from any of the others.

  • Page 19: Setting The Retrigger Mode

    Setting the Retrigger Mode The Retrigger Mode setting determines whether or not the slice pattern will be cued to the beginning when the START/STOP pedal is pressed during reception of MIDI Clock. 1. While holding down the PEDAL MODE button, turn on the power to the SL-20. The upper part of the TEMPO indicator lights in green.

  • Page 20: Returning Settings To Their Factory Defaults

    Returning Settings to Their Factory Defaults You can return the following settings to their original factory defaults. • Slice Pattern tempos • Expression Pedal Function setting (p. 15) • The tempo response when slice patterns are switched (p. 16) • Output Mode setting (p. 17) •...

  • Page 21: Troubleshooting

    Troubleshooting Power doesn’t come on ❍ Is the guitar or keyboard connected correctly to the INPUT R/MONO jack? → Check the connections again (p. 7–p.9). * The power will not turn on without a plug connected to the INPUT R/MONO jack. ❍...

  • Page 22: Setting Memo

    Setting Memo...
  • Page 23 Setting Memo...

  • Page 24: Main Specifications

    Dry battery R6 (AA) type (carbon) x 6 Options AC Adaptor (PSA series) Expression pedal (Roland EV-5) * 0 dBu = 0.775 Vrms * In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.

  • Page 25: Memo

    MEMO...
  • Page 26 MEMO...
  • Page 27 For EU Countries...
  • Page 28 This product complies with the requirements of EMC Directive 2004/108/EC. FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT 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.

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