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Everything In Music Since 1958
Everything In Music Since 1958

Boss GM-800 Guitar Synthesizer Effects Pedal

by Boss
Original price $0.00 - Original price $0.00
Original price $0.00
$749.99 - $749.99
Current price $749.99
♫ In stock
About Inventory Status

Call or text us at 301-946-8808.

In stock: It is in stock and available to ship or pickup. Apparel must be shipped from another location and is not available for in-store pickup. We can usually ship or have these items available for pickup by the next business day if they don't require inspection, special handling, or setup. Our pickup location is 11151 Veirs Mill Rd. Silver Spring, MD 20902.

📆 Preorder: It is on the way to our warehouse. We can't predict when preorder items will arrive due to current supply chain issues. If you place an order for one of these items someone will contact you to estimate the delivery date.

Out of stock: We don't currently have it available but you're not out of luck yet. We still may be able to get it. If you order one of these items we will contact you with an estimated fulfillment date. You have the option to cancel the order if you change your mind.

Special order: The item is so special that it needs to be custom ordered for you. Some of these items are works of art and have to be made individually. Orders for special order items must be prepaid and we cannot accept cancellations or refunds.

█ Sold out: We don't think we can get this item because it was either discontinued by the manufacturer or was limited in quantity. If you want or need this item call or text us. Sometimes we can help you track down the item through other sources or help you find something similar.

About Item Conditions

Call or text us at 301-946-8808.

New: The item is brand new as received from the manufacturer with a full manufacturer warranty. Instruments such as guitars, snare drums, drum kits, brass and woodwind instruments may be opened for photography and quality control inspection and may not be in a factory sealed box.

Mint or Open Box: The item may have been opened and tested but has been repackaged. The original packaging may have superficial issues but the item itself and any originally included accessories are in perfect, like new condition.

Display Model: These items are so cool that we put them on display in our legendary shop. The condition is brand new as received from the manufacturer with manufacturer warranty. Rest assured, these items undergo a very careful inspection before shipping.

Demo: These items have been on our sales floor for demo purposes and will likely show signs of use. The original packaging may no longer be included, but you can be assured that you are receiving an awesome item and an awesome price.

Used: The item is used. These item may have varying degrees of wear. Please read the description for information about the condition of the item. Used items do not carry a warranty.

B or C Stock: Factory refurbished. These items were purchased from the manufacturer in a refurbished condition. They will show some cosmetic issues, but nothing that would impact performance. Being that these are sealed from the manufacturer, we generally do not open these to photograph the cosmetic issues. They are guaranteed to work and may have a limited warranty or you may purchase an extended warranty in some cases. Please see the listing description for item specific information.

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The Latest Milestone in Guitar Synth Innovation - The Boss GM-800 Guitar Synthesizer Effects Pedal

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.

  • 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 foreach 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 stand alone synthesizer sound module for MIDI keyboard use or DAW sound expansion
  • Edit Scenes and organize sounds on your computer with BOSS Tone Studio

Cables, Footswitches, and GK-5 pickup sold separate


Sound Generator

  • ZEN-Core


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


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


  • 150


  • 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 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)


  • 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


  • Graphic LED 256 x 80 dots


  • 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

Power Supply

  • AC Adaptor

Current Draw

  • 840 mA


  • 246 (W) x134 (D) x 63 (H) mm (without rubber foot)
  • 9-11/16 (W) x 5-9/32 (D) x 2-31/64 (H) inches (without rubber foot)
  • 246 (W) x134 (D) x 65 (H) mm (including rubber foot)
  • 9-11/16 (W) x 5-9/32 (D) x 2-9/16 (H) inches (including rubber foot)


  • 1.2 kg
  • 2 lbs 9 oz

Manufacturer: Boss
Model: GM-800
SKU: I750911-N-3-WHXB
UPC: 761294518755

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Maryland, Virginia, and Washington DC's legendary music shop. Family-owned and operated since 1958. Buy gear the way it was meant to be bought, from a store that's been there through it all and has the vibe to prove it. We're staffed with musicians and industry experts, people that live and breathe music gear. Our mission is to help you find the right gear for your project, that thing that will bring you the most joy out of what you do. We're an authorized dealer for almost every brand, we stock items the other stores don't, so you can try before you buy. Stop by our Wheaton, MD showroom and see for yourself.

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