Boss Modulation Effects Processor Pedal, MD-500

The Boss MD-500 Modulation Effects Processor provides an extensive range of modulation effects, featuring effects developed from cutting edge technology with intensive programming parameters for an almost limitless palate of sounds. Each algorithm has been newly designed specifically for the RV-500, providing incredibly unique effects while enhancing the popular modulations like chorus, phase, flange, vibrato, and tremolo. Switch to A/B simul mode to use two patches at the same time, and connect your favourite gain/drive to the FX looper and place it anywhere in the chain. Powered by advanced Boss technology, the MD-500 Modulation pedal is perfect for adding extra depth and dynamics to your sound.

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Incredible Range of Reverbs

Offering an extensive range of modulations to choose from, the Boss MD-500 Pedal delivers everything from classic chorus, flange, and phaser, to the dynamic dimension, rotary, and filter effects. The pedal also features original Boss effects, with the slicer providing the effect from their SL-20 slicer pedal, and the overtone delivering their MO-2 Multi Overtone Pedals Sound. Offering 12 modes and a total of 28 different algorithms, the Boss pedal refreshes the standard modulations with their advanced prime algorithms, enhancing their expression, extending the tonal range, and maximising transparency.

Dual Modulations & Insert Loop Function

Set the pedal in A/B simul mode to use 2 modulation patches simultaneously, opening a range of tonal possibilities. Run the two mods in series or parallel, expanding the pedals tone-shaping capabilities. An external loop is also featured on the pedal, providing the ability to connect a gain or drive pedal to provide extra tonal possibilities. Set the effects order to create a range of different tones, setting the drive/gain pedal before, after, or in between the two modulation effects.

Intuitive Control Setup

Boss’ MD-500 is designed to deliver incredible creative expression and performance flexibility, ensuring players can easily adjust parameters for simple changes or extensive adjustments. Its large LCD display ensures players can clearly see patch names, delay times, and other important information, making it easy to adjust parameters and advanced control features. Its freely assignable switches and extensive support for real-time control is perfect for a range of applications, and the MIDI I/O provides more creative possibilities and deep control options. Connect the modulator to your computer, via the USB port, and use the free MD-500 editor/librarian for remote editing, patch backup, and more.



  • Studio-level sound with first-in-class 32-bit AD/DA, 32-bit floating point processing, and 96 kHz sampling rate
  • 12 modes and 28 modulation types, all with deep editing parameters
  • Classic mod effects and BOSS originals, newly enhanced with cutting-edge technology
  • A/B Simul mode for using two patches at once, with your choice of series/parallel connection and mixed or split A/B output
  • Insert Loop function allows you to use mod effects before, after, or around drive pedals
  • Graphic LCD and intensive real-time control options
  • 297 onboard patch memories and hands-on controls
  • Selectable buffered-bypass or true-bypass operation
  • MIDI I/O for interfacing with MIDI control devices
  • USB-MIDI for connecting to the MD-500 Editor/Librarian or a DAW
  • Runs on four AA-size batteries or PSA-series AC adaptor



  • Sampling Frequency: 96 kHz
  • AD/DA Conversion: 32 Bits
  • Processing: 32-Bit Floating point
  • Modulations:
    • Chorus
    • Flanger
    • Phaser
    • Classic Vibe
    • Vibrato
    • Tremolo
    • Dimension
    • Rig Mod
    • Rotary
    • Filter
    • Slicer
    • Overtone
  • Memory: 198 (99 Banks x 2), 297 (99 banks x 3)
  • Bypass: Buffered Bypass or True Bypass (With Relays)
  • Controls:
    • Switches: A, B, TAP/CTL
    • Buttons: Down, Up, Exit, Edit
    • Knobs: Mode, Rate/Value, Depth, E.Level, Param 1, Param 2
  • Display: Graphic LCD (128 x 64 Dots, Backlit LCD)
  • Accessories:
    • Owner's Manual
    • Leaflet "Using The Unit Safely"
    • Alkaline Battery (AA, LR6) x 4


  • Connectors:
    • Input (A/Mono, B) 1/4’’ Jacks, Output (A/Mono, B) 1/4’’ Jacks
    • CTL 1,2/EXP 1/4'’ TRS Jack
    • USB Type B
    • MIDI (In, Out) Connectors
    • DC In jack
  • Nominal Input Level: -10 dBu
  • Maximum Input Level: +8 dBu
  • Input Impedance: 1 M Ohm
  • Nominal Output Level: -10 dBu
  • Maximum Output Level: +8 dBu
  • Output Impedance: 2 k Ohms
  • Recommended Load Impedance: 20 k Ohms or Greater

Power Requirements

  • Power Supply: Alkaline Battery (AA, LR6) x 4, AC Adaptor (Sold Separately)
  • Current Draw: 225 mA
  • Battery Life (Under Continuous Use):
    • Alkaline: Approx. 4.5 Hours


  • Width: 6.75’’ (170 mm)
  • Depth: 5.4375’’ (138 mm)
  • Height: 2.5’’ (62 mm)
  • Weight (Including Battery): 1.0 kg (2 lbs 4 oz)
More Information
Brand Boss
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