BOSS GR-800 Guitar Synthesizer

The GM-800 elevates guitar synthesis into a new age of natural playability and boundless creative range. Driven by the newly developed Serial GK interface, the advanced ZEN-Core sound engine unlocks any sound imaginable—from acoustic instruments to classic and modern synths—while high-performance DSP delivers tracking stability and expressive scope never before possible. Freely combine and edit Tones with the intuitive Scene workflow, color sounds with a huge selection of effects, and explore a universe of fresh content on Roland Cloud. Compact, streamlined, and ultra-versatile, the GM-800 infuses your guitar or bass with unlimited musical potential.

For optimal performance, stay up to date with the current GM-800 system software and BOSS Tone Studio

Download “BOSS TONE STUDIO for GM-800” for Windows/macOS

• Next-generation guitar and bass synthesizer with the newly developed Serial GK interface
• Advanced ZEN-Core sound engine derived from flagship Roland synthesizers
• Natural playing feel and solid tracking stability, realized through high-performance DSP
• Powerful Scene workflow with four Tones plus Rhythm
• Vast onboard sound library with over 1200 Tones and 70 Rhythm sounds
• Explore Sound Packs, Wave Expansions, legendary Roland instruments, and more on Roland Cloud
• Deep editing tools for each Tone, including sound parameters, sensitivity settings, and more
• 150 user-configurable Scenes, including 100 Scenes with professional ready-to-play sounds
• Over 90 total effect types available in each Scene
• Space-saving design flows into every setup, from pedalboard to desktop
• Serial GK expansion jack for connecting to another BOSS guitar synthesizer product
• Two external control jacks, each with support for up to two footswitches or an expression pedal
• USB audio/MIDI connectivity and standard MIDI I/O
• Guitar to MIDI function for playing external MIDI instruments via USB or a MIDI cable
• Also functions as a standalone synthesizer sound module for MIDI keyboard use or DAW sound expansion
• Edit Scenes and organize sounds on your computer with BOSS Tone Studio
• Download and share GM-800 Livesets at BOSS Tone Exchange*

*For sharing on BOSS Tone Exchange, Scenes in Livesets must be created using the internal GM-800 sounds.

The Latest Milestone in Guitar Synth Innovation

BOSS and its parent company Roland have been the worldwide leaders in guitar synthesizer innovation for nearly five decades, beginning with the revolutionary GR-500 system in 1977. The GM-800 continues our dedication to this category, providing guitar and bass players with powerful creative tools and access to sounds typically only available with keyboard-based instruments. Expanding and elevating the concepts behind many historic Roland GR products, the GM-800 merges our latest pitch and string tracking advancements with a versatile, cutting-edge sound engine.

ZEN-Core Inside

The GM-800 is built around the expandable ZEN-Core Synthesis System, the sound source behind professional Roland products like the JUPITER-X and FANTOM keyboards, the ZENOLOGY software synthesizer, and many others. ZEN-Core is the most powerful synth engine in Roland’s long history, distilling decades of expertise into one sonically vast and deeply expressive creative instrument.

Over 1200 Sounds at Your Fingertips

The ZEN-Core engine combines modern PCM synthesis and advanced modeling to bring you an infinite playground for sonic discovery. Play acoustic pianos, EPs, organs, and orchestral instruments. Tap into classic Roland synths like the JUPITER-8, JUNO-106, and many others. And combine them all together to build sounds never heard before.

Learn More About the ZEN-Core System

Four Tones Plus Rhythm

The GM-800 features four Tone parts plus a Rhythm part filled with acoustic and electronic percussion sounds. Call up a part with the dedicated panel buttons, then explore a deep array of synth parameters, pitch settings, alternate tunings, and string assignments to shape sounds to perfection.

Intuitive Scene Workflow

The ZEN-Core workflow is based around Scenes, which are “super patches“ containing every element in a sound: Tone selection, parameters tweaks, sensitivity and other play settings, effects, and more. And thanks to the muscular DSP, you can carry over the sound of the current Scene as you select a new one for seamless musical transitions. There are 150 user-configurable Scenes, and 100 come with pro sounds ready to play immediately.

Roland Cloud Expansion

The GM-800 supports an ever-growing range of creative options through Roland Cloud. Stay inspired with ZEN-Core Sound Packs and Wave Expansions. And play the ZENOLOGY synthesizer and legendary Roland instruments in your DAW from your guitar or bass. You can start using Roland Cloud right away with a free Roland Account and access additional content via three paid membership levels. All plans start with a free 30-day Ultimate trial to experience everything Roland Cloud has to offer.

Learn More About the Roland Cloud

Massive Effects Power

The GM-800 packs the full effects range of the modern ZEN-Core system. With an immense variety of effect types available in each Scene, you can shape, enhance, and mangle sounds to your heart’s delight.

Dedicated MFX for Each Part

Along with their sound-shaping parameters, every Tone and Rhythm part has a dedicated MFX processor. Each offers over 90 effect types, including distortions, filters, mod effects, delays, and more. Many selections include two effect types for additional sound-shaping control.

Scene and System Effects

Within every Scene, you also get two additional FX for processing the combined sound, plus high-quality chorus/delay and reverb effects with independent send levels from each part. And with the Master Comp and EQ, you can shape the GM-800’s sound output for any recording or performance setup.

Unlimited Guitar Expression

The GM-800 lets you harness an endless variety of sonic textures using the expressive playing characteristics of your guitar and bass. Optimize the performance with continuous pitch control or chromatic operation. Layer Tones to create rich, combined voices. Or assign them to individual strings, such as a bass sound on the low strings and a piano or sax sound on the high strings. You can even assign Tones to specific fret ranges, a powerful new feature made possible with the GM-800’s advanced pitch detection.

Next-Generation Playability

The GM-800 delivers accuracy, stability, and real-time playability standards that far exceed previous systems, realized through skilled BOSS engineering and a high-speed processor dedicated solely to tracking. Multiple velocity and feel parameters let you dial in the optimal response for every sound and style. For example, you can set a Scene with piano sounds to respond to every dynamic nuance—from soft to loud—while setting another Scene with vintage analog synth sounds to the fixed velocity response found in the original instruments.

Compact Performer

The streamlined GM-800 flows smoothly from desktop operation to installation on an advanced pedalboard. The four footswitches default to Scene selection and two unique control settings, such as pedal hold, pitch bend, or Tone selection. But you can freely assign them to control a variety of functions via a powerful Assign matrix. Two external control jacks are also available, each supporting up to two footswitches or an expression pedal. And with five-pin MIDI I/O, you can interface with MIDI equipment from vintage to modern.

Expand Your Creative World

Along with standalone operation, the GM-800 merges seamlessly into a variety of expanded creative environments.

Edit Sounds with BOSS Tone Studio

Craft Scenes in detail from your computer using the BOSS Tone Studio software for the GM-800. Set up Tones, string assignments, sensitivity, and more from a large, friendly interface. Then use the Librarian function to organize your Scenes for different songs and performances.

Audio/MIDI Interface

With a single USB cable, you can capture GM-800 sounds as audio tracks in a DAW and “re-synth“ sounds in a similar way to the re-amp technique used with standard guitar tones. A Guitar to MIDI function is also available, allowing you to play virtual instruments over USB and trigger hardware sound modules via the MIDI output.

MIDI Sound Module

The versatile GM-800 can do double duty as a compact, go-everywhere MIDI sound module. Connect a keyboard or other MIDI controller to the five-pin MIDI input to play sounds live. Or use the ZEN-Core engine as a premium USB sound source within your music production workflow.

Multifaceted Connectivity

The GM-800 features the newly developed Serial GK digital interface, which supports guitar/bass input from a BOSS GK-5 or GK-5B Divided Pickup and easy linking of multiple GM-800 units. GKC-AD and GKC-DA conversion boxes are also available for classic 13-pin GK devices, allowing you to drive the GM-800 with a Roland GK-3 or GK-3B pickup and use Serial GK devices with the BOSS SY-1000 and GP-10.

Specifications

Sound Generator

ZEN-Core

Parts

5 parts (Play part: 4, Rhythm part: 1)

Tones

Preset tone: 1,200 or greater
Preset Drum Kit: 70 or greater
Import tone: 256

Scenes

150

Effects

Part Multi-Effects: 1 system (for each part), 93 types
Part EQ: 1 system (for each part)
Reverb: 7 types
Chorus/Delay: 9 types
Scene MFX: 2 systems (Serial or Parallel selectable), 93 types
Master EQ / Comp

Nominal Output Level

OUTPUT (L/PHONES, R/MONO): -10 dBu

Maximum Output Level

OUTPUT (L/PHONES, R/MONO): +7 dBu

Output Impedance

OUTPUT (L/PHONES, R/MONO): 44 ohms

Recommended Load Impedance

OUTPUT (L/PHONES, R/MONO): 10 k ohms or greater (Phones: 44 ohms or greater)

Controls

SCENE DOWN switch, SCENE UP switch, CTL1--2 switches
PART1--4 buttons, PART R button, EXIT button, WRITE button, MENU button, PAGE buttons
1--4 knobs, SELECT knob, OUTPUT LEVEL knob

Display

Graphic LCD 256 x 80 dots

Connectors

GK IN jack: 1/4-inch TRS phone type (for BGK cable only)
GK OUT jack: 1/4-inch TRS phone type (for BGK cable only)
OUTPUT (L/PHONES) jacks: 1/4-inch TRS phone type
OUTPUT (R/MONO) jacks: 1/4-inch phone type
CTL3, 4/EXP1 jack, CTL5, 6/EXP2 jack: 1/4-inch TRS phone type
USB COMPUTER port: USB B type (supports High-Speed USB, USB Audio, and USB MIDI)
USB MEMORY port
MIDI connectors (IN, OUT)
DC IN jack

External Memory

USB Flash drive (sold separately)

Power Supply

AC adaptor

Current Draw

840 mA

Accessories

AC adaptor (PSB-1U + AC Cord Set)
Quick Start
Leaflet “USING THE UNIT SAFELY“
Rubber foot x 4

Options (sold separately)

Divided pickup: GK-5 (for guitar), GK-5B (for bass guitar)
Serial GK cable: BGK-15 (15 ft./4.5 m), BGK-30 (30 ft./9 m)
GK converter: GKC-DA, GKC-AD
Footswitch: FS-5U, FS-5L, FS-6, FS-7
Expression Pedal: EV-30, FV-500L, FV-500H, Roland EV-5
AC adaptor (PSB-1U) (*1)
*1 When purchasing an AC adaptor, be sure to specify the adaptor (from the list that follows) that is designed for the region in which it will be used, and the voltage supplied there.
(PSB-120/PSB-120TW/PSB-230EU/PSB-230UK/PSB-240A)

Size and Weight

Width

246 mm
9-11/16 inches

Depth

134 mm
5-9/32 inches

Height

63 mm
2-31/64 inches

Height (including rubber foot)

65 mm
2-9/16 inches

Weight (excluding AC adaptor)

1.2 kg
2 lbs 9 oz

* 0 dBu = 0.775 Vrms

*The specifications are subject to change without notice.