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
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 dBuM
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 LED 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
Power Supply
- AC Adaptor
Current Draw
- 840 mA
Dimensions
- 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)
Weight
- 1.2 kg
- 2 lbs 9 oz
Manufacturer: Boss
Model: GM-800
SKU: I750911-N-0-WHXB
UPC: 761294518755
We are Chuck Levin’s Washington Music Center
Since 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.
Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.
Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.





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