Does the octave go up and down?

Octave adds one octave lower and mixes them

Does the Boss ME-20B bass guitar effects pedal come with the power adapter or is that a seperate purchase?

It comes with it's own adapter and also runs on double A batteries if you don't want to use the adapter

Does it have a wah peddle

Hi, Yes it has a Wah function. If there is anything else I can do for you, please feel free to contact me at 716-675-7815 or toll free 1-800-863-4347. I am in the office Monday-Friday 10am-6pm(eastern time). Thank you! ~Matt

Does me-20b come with a boss brand psa 120s power adapter, a cheaper brand, or none at all? is same from all sellers? please be specific. thanks.

Hi, Boss does not include a power supply with this pedal. The Boss PSA-120 power supply is sold separately.

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Boss ME-20B Bass Multiple Effects Pedal Board

Product ID: 3945312

Details

Brand
BOSS
Color
silver
Item Weight
4.5 Pounds
Style
Multi-effects
Voltage
9 Volts

🎸unique bass-focused effects

🦾super-tough metal chassis

🎛️5 realtime control knobs

Description

🎸 Own the stage with bass tones that demand attention!

EXPRESSIVE CONTROL - 3 footswitches plus an expression pedal for dynamic, hands-free effect manipulation
SIGNATURE BASS EFFECTS - Exclusive Synth, Octave, Defretter, and BASS ENHANCE for instant presence boost
STAGE READY DURABILITY - Built with a rugged metal chassis to withstand live performance rigors
EFFORTLESS SOUND SCULPTING - Intuitive EZ Edit interface for lightning-fast tone creation
VERSATILE MULTI EFFECTS SUITE - Includes compressor, overdrive, distortion, delay, reverb, chorus, and more to cover every sonic need

The Boss ME-20B is a performance-driven bass multi-effects pedal featuring a robust metal chassis, 3 footswitches, 5 realtime control knobs, and an expression pedal. Designed for live bassists, it offers a wide palette of effects including unique bass-centric options like Synth, Octave, Defretter, and a BASS ENHANCE function for instant presence. Its EZ Edit interface ensures quick, intuitive sound crafting, making it an essential tool for professionals seeking reliable, versatile tone-shaping on stage.

Specifications

ASIN	B000V7T03A
Amperage	20 Milliamps
Audio Output Effects	Distortion, Delay, Reverb, Chorus, Compression, Synth, Overdrive, Flanger, Phaser, T-Wah, Defretter
Best Sellers Rank	#185,449 in Musical Instruments ( See Top 100 in Musical Instruments ) #37 in Bass Guitar Multieffects #46,583 in Guitar & Bass Accessories
Brand Name	BOSS
Color	silver
Controls Type	Knob
Customer Reviews	3.6 3.6 out of 5 stars (15)
Global Trade Identification Number	00761294403198
Hardware Interface	1/4-inch Audio
Item Dimensions	14.2 x 10 x 4.3 inches
Item Weight	4.5 Pounds
Manufacturer	Boss
Manufacturer Part Number	ME-20B
Model Name	ME20B
Model Number	ME-20B
Power Source	Battery Powered
Signal Format	Analog
Style	Multi-effects,Delay,Reverb,Chorus,Bass,Compressor,Distortion,Overdrive,Expression
UPC	761294403198
Voltage	9 Volts

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TrustScore 4.5 | 7,300+ reviews

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