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Boss GM-800 Guitar & Bass Synthesizer Pedal

Next-generation guitar/bass synth stompbox with advanced Roland ZEN-Core sound engine!



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SKU: GM-800

Product Description

The Boss 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, colour 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!

Key Features

  • Next-generation guitar and bass synthesizer with the newly-developed Serial GK interface.
  • Advanced ZEN-Core sound engine derived from flagship Roland synthesizers, including the Jupiter-X and Fantom keyboards.
  • 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 organise 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).

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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.


  • Sound Generator: ZEN-Core
  • Parts: 5 (Play Part: 4, Rhythm Part: 1)
  • Scenes: 150
  • Display: Graphic LCD 256 x 80 dots
  • External Memory: USB Flash drive (Sold Separately)
  • Power Supply: AC Adaptor (Included)
  • Current Draw: 840 mA


  • Preset Tone: 1,200 or Greater
  • Preset Drum Kit: 70 or Greater
  • Import Tone: 256


  • 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


  • 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


  • 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)
  • MIDI Connectors (IN, OUT)
  • DC IN Jack

Weight & Dimensions

  • Weight: 1.2 kg / 2.65 lbs
  • Dimensions (W x D x H): 246 x 134 x 63 mm / 9.685 x 5.276 x 2.48 inches

Accessories (Included)

  • AC Adaptor (PSB-1U & AC Cord Set)
  • Quick Start Guide
  • Leaflet (Using the Unit Safely)
  • Rubber Feet (x4)

Options (Sold Separately)

Customer Reviews


3 reviews





Trusted Customer25th Feb 2024

great product but difficult to unravel with their manuals and parameter guide.

Value 3Looks 4Durability 3Sound 5

Mr IAN STONE27th Nov 2023

Value 4Looks 4Durability 4Sound 4

Trusted Customer22nd Sep 2023

Value 3Looks 5Durability 4Sound 5

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Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.