• 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 adapter

The MD-500 includes 12 modes with 28 different mod effect algorithms, and every one of them has been newly developed specifically for this pedal. All the go-to standards are here: chorus, vibrato, flanger, phaser, tremolo, rotary, classic vibe, and ring mod. Auto wah and touch wah effects are on hand too, plus BOSS originals like Slicer and Overtone. Slicer fans will welcome the ability to program custom patterns, an additional feature to the original SL-20 Slicer pedal. And with the MD-500’s spot-on recreation of Roland’s Dimension D from the 1980s, you can add amazing width and depth with one of the most revered studio rack effects of all time.

Chorus—Four types: Prime, CE-1 Chorus, CE-1 Vibrato, and TRI-CHO.
Flanger—Two types: Prime G (for guitar) and Prime B (for bass).
Phaser— Three types: Prime G (for guitar), Prime B (for bass), and Script.
Classic Vibe—Two types: Chorus (mixed output) and Vibrato (effect-only output).
Vibrato—Two types: Prime and Scanner (tonewheel organ-style vibrato).
Tremolo—Four types: Prime T and Prime P, plus Twin and Deluxe amp-style tremolo.
Dimension—Models the legendary Roland SDD-320 Dimension D rack unit; includes the original four sound modes and an all-new fifth mode, plus a user setting for saving any combination of modes.
Ring Mod—Classic ring modulation effects, plus Intelligent mode for enhanced clarity when playing scales.
Rotary—Vintage rotating speaker effect with slow and fast speeds.
Filter—Auto wah and touch wah (with independent types optimized for guitar and bass), plus pattern filter type.
Slicer—Original BOSS effect derived from the popular SL-20 Slicer, with programmable options not available in the SL-20 pedal.
Overtone—Original BOSS effect based on the MO-2 Multi Overtone pedal; uses MDP tech to alter the input signal’s pitch and harmonic characteristics, allowing you to create unique new sound textures.