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BOSS ME-50B Bass Multiple Effects Best Guitar Effects Pedal Compressor/Limiter, Master Filter/Tone, Drive/Synth, Delay/Modulation and Expression Pedal


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The BOSS ME-50B puts world-class bass effects in a rugged floor unit with easy pedal-style control. Effects are divided into six sections-Compressor/Limiter, Master, Filter/Tone, Drive/Synth, Delay/Modulation and Expression Pedal-giving bassists a range of unique and powerful tones including new effects like Sound Hold, Octave Up and Kick Drum. Effects can be edited using 23 knobs and controlled via three built-in footswitches and an assignable expression pedal. This is the piece no bass player should be without!

- Floor-based bass multi-effects processor with easy analog control
- Killer COSM Compressor/Limiter and Drive effects, plus T-Wah, Slow Gear and Defretter
- Innovative Sound Hold function for sustaining a low note while playing on top
- Sound On Sound recording with new Kick Drum effect for keeping time
- Dedicated knobs for each effect section-no menu-surfing!
- Easy Tone effects with Preset EQ templates for quick tone editing
- 3 footswitches and onboard expression pedal routed to 6 options like Octave, Wah, etc.
- Solid metal case built to withstand abuse

Multi-Effects Made Simple
BOSS understands that bass players want access to powerful effects, but they don't want to get caught up in the menus and programming hassles of a multi-effects processor. Enter the ME-50B. Just like its guitar-oriented sibling, the new ME-50B puts BOSS' finest multi-effects for bass into a convenient floor processor with the feel of a compact pedal. Forget about menus and cursor buttons. Just reach down and twist a knob!

Independent COSM Compressor/Limiter and EQ
Everyone knows that the fundamentals of good bass tone are compression and EQ. That's why the ME-50B features two dedicated sections for these essential effects. The Compressor/Limiter uses advanced COSM modeling-including a "Natural" compression setting that retains the nuances of your playing-to give you tight, punchy tone. Simply select the compressor "Type" and adjust the Sustain/Threshold knob to get the tone you want. The Master section includes a 3-band EQ with a sweepable mid for precise tonal shaping.

Get Creative with Cool Filter/Tone Effects
The ME-50B includes a variety of unique tone-shaping effects just for bass. These include a handy "Octave Up" effect, which adds a note one octave above the original while retaining your natural bass sound-complete with adjustable drive on the octave-shifted note-plus favorites like Slow Gear, T-Wah and a Defretter effect for instant fretless sounds. Using the Tone effect preset, you can get quick tonal variations with preset EQs like "Bottom Boost" and "Mid Shape."

Incredibly Warm Overdriven Sounds and More
Want some extra bite? Switch on the ME-50B's Drive effects, which include settings like "Muff Fuzz," "Bass Driver," "Natural" and "Metal" to give you a range of overdriven/distorted sounds. A new "Hi Band" effect creates a distorted sound on the high frequencies while keeping the lower frequencies intact-perfect for creating complex tones while keeping your original playing dynamics. There are also four synth bass sounds with superb tracking and natural feel.

Sound On Sound with a Twist
Sound On Sound recording is very popular with guitarists, and now bass players can build their own loops, too. But the ME-50B can do even more. Using the new Kick Drum function, players can tap in their own kick drum and create loops over the beat. If that's not enough, check out the new Sound Hold function, which lets you endlessly sustain a low note while playing over it. With the ME-50B, bassists can take their playing to a whole new level.



1. Can I use my headphones with the BOSS ME-50B?

  • Yes. The BOSS ME-50B has an output for headphones.

2. Does the BOSS ME-50B work with bass?

  • Yes, the BOSS ME-50B is designed for bass.

3. Can I save the effects on the BOSS ME-50B?

  • Yes, the BOSS ME-50B has a memory bank where you can store the effects.

4. Can I use the BOSS ME-50B with a synth bass?

  • Yes.

5. Does the BOSS ME-50B work with a keyboard?

  • Yes. The BOSS ME-50B works well with a keyboard.

6. Can I use the BOSS ME-50B to make a loop?

  • No. The BOSS ME-50B does not have a looper function.

7. Does the BOSS ME-50B lose the low ends when using distortion?

  • No. The low-ends are retained and the BOSS ME-50B still gives you a great tone.

8. Does the BOSS ME-50B work as an amp head?

  • No. The BOSS ME-50B works with an amp head but does not function as one.

9. Does the BOSS ME-50B work with an electric violin?

  • Yes.

10. Does the BOSS ME-50B work with an electric guitar?

  • Yes, but the BOSS ME-50B is designed for bass. The BOSS also offers the ME-50 for guitars.

11. Does the BOSS ME-50B work with a power supply?

  • Yes, the BOSS ME-50B works with a 9v power supply.

12. Does the BOSS ME-50B work with a Microkorg?

  • Yes.

13. Can I use the BOSS ME-50B to control my ODB-3?

  • Yes.

14. Is the BOSS ME-50B digital?

  • Yes, the BOSS ME-50B has a digital circuit but it feels like an analog pedal.


  • AD Conversion: 24 bit + AF method*
  • DA Conversion: 24 bit
  • Sampling Frequency: 44.1 kHz
  • Patches: 24 (user)
  • Effects: Compressor / Limiter, Filter / Tone: T. Wah, Octave (Up / Down), Slow Gear, Defretter, Enhancer, Bottom Boost, Mid Shape, Hollow, Drive / Synth: Overdrive / Distortion, Bass Synth
  • Delay / Modulation: Delay, Phaser, Flanger, Chorus, Reverb, Noise Suppressor Master EQ
  • Effects for Expression Pedal: Foot Volume, Wah, Resonance, Bend (+1 OCTAVE, -1 OCTAVE), Sound Hold, Kick Drum
  • Nominal Input Level: INPUT: -10 dBu, AUX IN: -10 dBu
  • Input Impedance: INPUT: 1 M ohms, AUX IN: 100 k ohms
  • Nominal Output Level: -10 dBu
  • Output Impedance: 2 k ohms
  • Display: 7 segments, 1character LED
  • Connectors: INPUT jack, OUTPUT jacks L (MONO)/ R, AUX IN jack (Stereo Mini type), PHONES jack, FOOT SW (COMP ON/OFF, TEMPO), AC Adaptor jack
  • Power Supply: DC 9 V: Dry batteries (R6/LR6 (AA) type) x 6, AC Adaptor (PSA series: Optional)
  • Current Draw: 140 mA
  • Accessories: Owner's Manual, Dry Batteries (Alkaline: LR6 (AA) type) x 6
  • Options: AC Adaptor: BOSS PSA series, Foot Switch: BOSS FS-5U, Dual Footswitch: BOSS FS-6, BOSS FS-7

Size & Weight (Incl. Batteries)

  • Width: 384 mm, 15-1/8 inches
  • Depth: 225 mm, 8-7/8 inches
  • Height: 78 mm, 3-1/8 inches
  • Weight: 3.2 kg, 7 lbs.

*0 dBu = 0.775 Vrms
*AF method (Adaptive Focus method) This is a proprietary method from Roland that vastly improves the signal-to-noise (S/N) ratio of the A/D and D/A converters.
*The specifications are subject to change without notice.

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