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Boss ME-20B Bass Guitar Multi Effect Pedal


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  • Delivery: FREE
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  • Performance-based bass processor for the player who wants an easy-to-use interface with BOSS tone and quality
  • New super-tough metal chassis with 3 footswitches, 5 realtime control knobs, and expression pedal
  • EZ Edit for quick sound creation
  • Unique effects such as Synth, Octave, Defretter, and more
  • 30 user memory locations in addition to realtime operation
  • Battery or AC powered
Finance Options
  • Flexible finance available on orders over £250
  • Easy application online
  • Spread your payments over 12, 24 or 36 months
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Delivery & Returns

Delivery to UK mainland addresses* is FREE on orders over £50 and up to 30kg. (As a guide, a standard electric guitar weighs approx. 3-5kg).

Delivery on orders below £50 are charged at £4.45!

Delivery to Northern Ireland, the Scottish Highlands & Islands, Isle of Man, Isle of Wight, Channel Islands and the Republic of Ireland. is weight dependant and will be indicated at the checkout

Delivery above 30kg to ANY location will vary according to weight and will be indicated at the checkout

LocationPriceStandard Delivery
UK mainland*FREE on orders over £50 £4.45 on orders under £501-3 working days
Northern Ireland, Scottish Highlands & Islands Isle of Man Isle of Wight Channel Islands Republic of Ireland£12.95 – any order value up to 30kg Over 30kg - please call1-3 working days
OverseasPlease call for detailsPlease call

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The second new offering in the ME series is the ME-20B, a powerful multi-effects unit optimized for live performance. With the same performance-based design as its guitar-focused ME-20 counterpart, the ME-20B Multiple Effects Processor is aimed at the performing bassist who wants stage-friendly effects and solid construction at an affordable price. Mix, match, and customize a wide variety of effects, including compressor, overdrive, distortion, T-Wah, phaser, flanger, chorus, delay, reverb, defretter, synth, and more.

Simple Operation — Works Like Compact-Pedal Effects

To get the sound you want, simply select an effect and tweak it using the knobs. It’s the same simple operation offered by compact-pedal effects. Special attention has been given to ease of operation and speed of use — ideal for immediate editing on stage or in the studio.

FX for Bassists

Mix, match, and customize a wide variety of effects for bass, including compressor, overdrive, distortion, T-Wah, phaser, flanger, chorus, delay, reverb, defretter, synth, and more.


This function strengthens bass dynamics with a simple button press, adding richness and impact to the tone. You can also activate the effect with an optional pedal — great for instantly activating a "bass solo" tone.

EZ EDIT for Quick Sound Creation

EZ EDIT lets you create sounds quickly and intuitively, with incredible ease and speed like no other multi-effects unit on the market. You can adjust a combination of effect parameters with a single knob, and then save your creations for instant recall.

Memory Function

Up to 30 of the sounds you create can be stored in the ME-20B’s User memory. In Memory mode, you can use the pedals to instantly select a stored sound. Since the ME20B makes it so easy to create new sounds, the user memory bank ensures that you’ll never lose those perfect patches.


Plug a CD or MP3 player into this input jack and jam along with your favorite music. It’s also a great way to plug in and play along with your favorite bass heroes to help build and strength your chops.

Battery Powered Operation

The ME-20B Bass Multiple Effects Processor runs on battery power (six AA dry cells) so you can use it anywhere. You can also use the optional AC adaptor for extended performances. Wherever you travel, the Boss ME 20B goes with you and never requires an additional AC outlet. For those who want to plug in, however, an optional AC adaptor can be used.

AD Conversion 24-bit + AF method
DA Conversion 24-bit
Sampling Frequency 44.1 kHz
Patches 30 (user)
Nominal Input Level INPUT: -10 dBu, AUX IN: -18 dBu
Input Impedance INPUT: 1 M ohm, AUX IN: 22 k ohms
Nominal Output Level -10 dBu
Output Impedance 2 k ohms
Display 7 segments, 2 characters LED
Controls SFX/1 pedal, COMP/2 pedal, DELAY/3 pedal, Expression pedal
Connectors INPUT jack (1/4 inch phone type), AUX IN jack (Stereo miniature phone type), OUTPUT jacks L/MONO, R (1/4 inch phone type), PHONES jack (Stereo 1/4 inch phone type), FOOT SW jack (1/4 inch TRS phone type), AC Adaptor jack
Power Supply DC 9 V: Dry battery LR6/R6 (AA) type x 6, AC Adaptor (PSA series: Optional)
Current Draw 90 mA * Expected battery life under continuous use: Alkaline: 13 hours, Carbon: 3.5 hours (These figures will vary depending on the actual conditions of use.)
Accessories Owner's Manual, Dry battery LR6 (AA) type (alkaline) x 6, Roland Service (Information Sheet)
Options AC Adaptor: PSA series, Footswitch: FS-6, FS-5U, Connection Cable: Roland PCS-31 (Stereo 1/4 inch phone plug - 1/4 inch phone plug x 2)
Width 294 mm/ 11-5/8 inches
Depth 179 mm/ 7-1/16 inches
Height 54 mm/ 2-1/8 inches
Weight 1.6 kg/ 3 lbs. 9 oz.
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