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Khunathorn Sarntikhup 55030059 sec1 
Thank you, and congratulations on your choice of BOSS ME-20 Guitar 
Multiple Effects. Before using this unit, carefully read the sections below. 
Contents 
1.Main Features 
2.Important Notes 
3.Name of Things and What They Do 
4.Troubleshooting 
5. Support
Khunathorn Sarntikhup 55030059 sec1 
Main Features 
 Simple Operation—Works Like a Compact Pedal Effects 
All you need to do to get the sound you want is to select an effect, then tweak it 
using the knobs–basically, this is the same simple, intuitive operation offered by 
compact pedal effects. 
 OD(Overdrive)/DS(Distortion) Solo Function 
Give distortion sounds an intense boost and clarity simply and easily with the 
press of a singlebutton. You can also switch the effect with the pedal, a 
convenient feature for live performances. 
 EZ EDIT for Quick Sound Creation 
EZ EDIT is a feature that allows you to creating sounds quickly and easily. 
You can adjust a combination of effect parameters with just a single knob. 
 Memory Function 
Up to thirty of the sounds you create can be stored in the ME-20’s User 
memory. In “Memory mode,” you can use the pedals to instantly select a stored 
sound. 
 AUX IN Jack 
Thanks to this feature, it’s simple to play along with CD and MP3 players and 
other equipment. 
 Battery Powered Operation 
The ME-20 runs on battery power (six AA dry cells), allowing you to use it 
anywhere you play. You can also use the optional AC adaptor, giving you two
Khunathorn Sarntikhup 55030059 sec1 
ways to power the ME-20, so you can play for extended periods during live 
performances. 
Important Notes 
 Power Supply: Use of Batteries 
-The AC adaptor will begin to generate heat after long hours of consecutive use. 
This is normal, and is not a cause for concern. 
- Batteries should always be installed or replaced before connecting any other 
devices. This way, you can prevent malfunction and/or damage to speakers or 
other devices. 
 Maintenance 
-Never use benzine, thinners, alcohol or solvents of any kind, to avoid the 
possibility of discoloration and/or deformation. 
 Repairs and Data 
-Please be aware that all data contained in the unit’s memory may be lost when 
the unit is sent for repairs. Important data should always be written down on 
paper (when possible). 
 Additional Precautions 
-Unfortunately, it may be impossible to restore the contents of data that was 
stored in the unit’s memory once it has been lost.
Khunathorn Sarntikhup 55030059 sec1 
Name of Things and What They Do 
 Front Panel 
1. Parameter Knobs 
These adjust parameters selected with the effect buttons and EZ EDIT button. 
You can check a parameter’s current value by holding down its effect select 
button and turning the knob (this displays the value without adjusting it). 
2. Effect Select Indicators 
Show effects you can set using the parameter knobs. 
3. Effect Select Buttons 
Press these buttons to select the effect whose settings you want to change.
Khunathorn Sarntikhup 55030059 sec1 
4. EZ EDIT Indicator 
Shows whether EZ EDIT is on or off. 
5. EZ EDIT Button 
Press this to use EZ EDIT 
6. Display 
Shows the values of parameter settings , bank numbers, and other information. 
* When the batteries run down, “bt” is indicated in the display. When this 
occurs, replace with new batteries. 
7. EDIT/EXIT Button 
Press this to edit patches in Memory mode (or exit editing). 
8. WRITE Button 
Press this to save the current sound in User memory. 
9. / Buttons 
Use these to adjust parameters in the various operating modes. 
Manual mode: NS THRESHOLD 
Memory mode: Bank (NS THRESHOLD when editing patches) 
TUNER: Reference pitch 
10. WAH Indicator 
Shows whether the wah effect is on or off. 
11. OD/DS SOLO Indicator 
Shows whether the solo sound is on or off. 
12. OD/DS SOLO Button 
Press this to switch to a sound suited for solos. 
Pressing this button automatically switches on overdrive/distortion. 
13. MASTER LEVEL Knob 
Adjusts the volume of the output.
Khunathorn Sarntikhup 55030059 sec1 
14. Expression Pedal 
Controls the volume level (volume pedal). 
Firmly depressing the front end of the pedal switches WAH ON/OFF. 
When the wah effect is on, the pedal functions as a wah pedal. 
When WAH is on: 
Functions as a wah pedal. 
When WAH is off: 
Functions as a volume pedal. 
15. Pedal Indicators 
Show whether the corresponding effect is on or off. In Memory mode, they 
indicate the current patch number. 
16. Effect/Number Pedals 
Switch the corresponding effects on and off. When the ME-20 is in Memory 
mode, these switch correspondingly numbered patches. 
 Rear Panel 
1. SECURITY LOCK 
2. INPUT Jack 
Connect your guitar here. 
* The INPUT jack doubles as a power switch. Inserting a plug into the INPUT 
jack turns on the power; the power is switched off when the plug 
isdisconnected. Be sure to unplug the cable from this jack when the ME-20 is 
not in use. 
3. AUX IN Jack
Khunathorn Sarntikhup 55030059 sec1 
Connect a CD or MP3 player here to practice with sounds from these devices. 
* You cannot adjust the volume of the AUX input. Adjust the volume on the 
connected device. 
* Do not use a cable that contains a resistor to connect external devices to the 
AUX IN jack. 
Use of such cables may make sounds from connected devices inaudible. 
* No effects are applied to the AUX input signal. 
4. OUTPUT L/MONO, R Jacks 
Connect an amp or mixer here. 
5. PHONES (Headphones) Jack 
Connect stereo headphones here. 
6. FOOT SW (Footswitch) Jack 
Connect an optional footswitch (such as the FS-6) here. 
The footswitch functions differently in Manual mode and Memory mode. 
When in Manual mode: Switches the OD/DS Solo on/off. 
Switches the Bypass/Tuner on/off. 
When in Memory mode: Bank up, Bank down 
7. DC IN (AC Adaptor) Jack 
Connect the optional AC adaptor (PSA series) here. 
* Use only the specified AC adaptor (PSA series). 
Troubleshooting 
“bt” Appears in the Display 
→Batteries are run down. Replace with new batteries.
Khunathorn Sarntikhup 55030059 sec1 
Power does not turn on 
Is the plug properly connected to the INPUT jack? 
→Check the connection once again. 
* The power will not turn on without a plug 
connected to the INPUT jack. 
No Sound/Volume is Low 
Could the MASTER LEVEL knob be turned down? 
→Use the MASTER LEVEL knob to raise the output volume. 
Is the volume turned down? 
→Check the volume levels on any connected amp or mixer. 
Check “LEVEL” and other volume parameters to make sure no volume setting 
is too low. 
Support 
If you want to support us please visit : www.boss.com/multieffects
Khunathorn Sarntikhup 55030059 sec1

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Manual 59

  • 1. Khunathorn Sarntikhup 55030059 sec1 Thank you, and congratulations on your choice of BOSS ME-20 Guitar Multiple Effects. Before using this unit, carefully read the sections below. Contents 1.Main Features 2.Important Notes 3.Name of Things and What They Do 4.Troubleshooting 5. Support
  • 2. Khunathorn Sarntikhup 55030059 sec1 Main Features  Simple Operation—Works Like a Compact Pedal Effects All you need to do to get the sound you want is to select an effect, then tweak it using the knobs–basically, this is the same simple, intuitive operation offered by compact pedal effects.  OD(Overdrive)/DS(Distortion) Solo Function Give distortion sounds an intense boost and clarity simply and easily with the press of a singlebutton. You can also switch the effect with the pedal, a convenient feature for live performances.  EZ EDIT for Quick Sound Creation EZ EDIT is a feature that allows you to creating sounds quickly and easily. You can adjust a combination of effect parameters with just a single knob.  Memory Function Up to thirty of the sounds you create can be stored in the ME-20’s User memory. In “Memory mode,” you can use the pedals to instantly select a stored sound.  AUX IN Jack Thanks to this feature, it’s simple to play along with CD and MP3 players and other equipment.  Battery Powered Operation The ME-20 runs on battery power (six AA dry cells), allowing you to use it anywhere you play. You can also use the optional AC adaptor, giving you two
  • 3. Khunathorn Sarntikhup 55030059 sec1 ways to power the ME-20, so you can play for extended periods during live performances. Important Notes  Power Supply: Use of Batteries -The AC adaptor will begin to generate heat after long hours of consecutive use. This is normal, and is not a cause for concern. - Batteries should always be installed or replaced before connecting any other devices. This way, you can prevent malfunction and/or damage to speakers or other devices.  Maintenance -Never use benzine, thinners, alcohol or solvents of any kind, to avoid the possibility of discoloration and/or deformation.  Repairs and Data -Please be aware that all data contained in the unit’s memory may be lost when the unit is sent for repairs. Important data should always be written down on paper (when possible).  Additional Precautions -Unfortunately, it may be impossible to restore the contents of data that was stored in the unit’s memory once it has been lost.
  • 4. Khunathorn Sarntikhup 55030059 sec1 Name of Things and What They Do  Front Panel 1. Parameter Knobs These adjust parameters selected with the effect buttons and EZ EDIT button. You can check a parameter’s current value by holding down its effect select button and turning the knob (this displays the value without adjusting it). 2. Effect Select Indicators Show effects you can set using the parameter knobs. 3. Effect Select Buttons Press these buttons to select the effect whose settings you want to change.
  • 5. Khunathorn Sarntikhup 55030059 sec1 4. EZ EDIT Indicator Shows whether EZ EDIT is on or off. 5. EZ EDIT Button Press this to use EZ EDIT 6. Display Shows the values of parameter settings , bank numbers, and other information. * When the batteries run down, “bt” is indicated in the display. When this occurs, replace with new batteries. 7. EDIT/EXIT Button Press this to edit patches in Memory mode (or exit editing). 8. WRITE Button Press this to save the current sound in User memory. 9. / Buttons Use these to adjust parameters in the various operating modes. Manual mode: NS THRESHOLD Memory mode: Bank (NS THRESHOLD when editing patches) TUNER: Reference pitch 10. WAH Indicator Shows whether the wah effect is on or off. 11. OD/DS SOLO Indicator Shows whether the solo sound is on or off. 12. OD/DS SOLO Button Press this to switch to a sound suited for solos. Pressing this button automatically switches on overdrive/distortion. 13. MASTER LEVEL Knob Adjusts the volume of the output.
  • 6. Khunathorn Sarntikhup 55030059 sec1 14. Expression Pedal Controls the volume level (volume pedal). Firmly depressing the front end of the pedal switches WAH ON/OFF. When the wah effect is on, the pedal functions as a wah pedal. When WAH is on: Functions as a wah pedal. When WAH is off: Functions as a volume pedal. 15. Pedal Indicators Show whether the corresponding effect is on or off. In Memory mode, they indicate the current patch number. 16. Effect/Number Pedals Switch the corresponding effects on and off. When the ME-20 is in Memory mode, these switch correspondingly numbered patches.  Rear Panel 1. SECURITY LOCK 2. INPUT Jack Connect your guitar here. * The INPUT jack doubles as a power switch. Inserting a plug into the INPUT jack turns on the power; the power is switched off when the plug isdisconnected. Be sure to unplug the cable from this jack when the ME-20 is not in use. 3. AUX IN Jack
  • 7. Khunathorn Sarntikhup 55030059 sec1 Connect a CD or MP3 player here to practice with sounds from these devices. * You cannot adjust the volume of the AUX input. Adjust the volume on the connected device. * Do not use a cable that contains a resistor to connect external devices to the AUX IN jack. Use of such cables may make sounds from connected devices inaudible. * No effects are applied to the AUX input signal. 4. OUTPUT L/MONO, R Jacks Connect an amp or mixer here. 5. PHONES (Headphones) Jack Connect stereo headphones here. 6. FOOT SW (Footswitch) Jack Connect an optional footswitch (such as the FS-6) here. The footswitch functions differently in Manual mode and Memory mode. When in Manual mode: Switches the OD/DS Solo on/off. Switches the Bypass/Tuner on/off. When in Memory mode: Bank up, Bank down 7. DC IN (AC Adaptor) Jack Connect the optional AC adaptor (PSA series) here. * Use only the specified AC adaptor (PSA series). Troubleshooting “bt” Appears in the Display →Batteries are run down. Replace with new batteries.
  • 8. Khunathorn Sarntikhup 55030059 sec1 Power does not turn on Is the plug properly connected to the INPUT jack? →Check the connection once again. * The power will not turn on without a plug connected to the INPUT jack. No Sound/Volume is Low Could the MASTER LEVEL knob be turned down? →Use the MASTER LEVEL knob to raise the output volume. Is the volume turned down? →Check the volume levels on any connected amp or mixer. Check “LEVEL” and other volume parameters to make sure no volume setting is too low. Support If you want to support us please visit : www.boss.com/multieffects