So many possibilities, so little time. That's what you'll say when you find yourself blissfully lost in the musical Rabbit Hole that is the GM-800 Guitar Synthesizer.The BOSS GM-800 Guitar Synthesizer brings cutting-edge synth technology to your pedalboard, letting guitarists and bassists tap into a massive universe of sounds without changing instruments or hauling a 3-tier keyboard setup around. Powered by Roland’s ZEN-Core synthesis engine, the same tech behind flagship keyboards like the JUPITER-X and FANTOM, the GM-800 gives you access to everything from grand pianos and orchestral textures to vintage synths and modern sound design staples. With four independent Tone parts plus a dedicated Rhythm section, there’s room to layer, split, or assign different sounds across your strings, making it a seriously flexible tool whether you’re scoring cinematic swells or layering synth leads into a live set.What sets the GM-800 apart is its balance of deep customization and real-world playability. The Serial GK interface ensures fast, stable tracking and an expressive response that reacts naturally to your touch. Scenes let you bundle your Tone selections, tunings, pitch and sensitivity settings, and effects into one cohesive patch, and with plenty of onboard DSP muscle, you can switch Scenes at will without sonic hiccups. The GM-800 turns your guitar into a launchpad for creative ideas that go far beyond traditional tones. And with new content constantly rolling out via Roland Cloud, there’s always something fresh to inspire you.Boss GM-800 FeaturesNext-generation guitar and bass synthesizer with the newly developed Serial GK interfaceAdvanced ZEN-Core sound engine derived from flagship Roland synthesizersNatural playing feel and solid tracking stability, realized through high-performance DSPPowerful Scene workflow with four Tones plus RhythmVast onboard sound library with over 1200 Tones and 70 Rhythm soundsBoss GM-800 SpecificationsSound Generator:ZEN-CoreParts: 5 parts (Play part: 4, Rhythm part: 1)TonesPreset tone: 1,200 or greaterPreset Drum Kit: 70 or greaterImport tone: 256Scenes: 150EffectsPart Multi-Effects: 1 system (for each part), 93 typesPart EQ: 1 system (for each part)Reverb: 7 typesChorus/Delay: 9 typesScene MFX: 2 systems (Serial or Parallel selectable), 93 typesMaster EQ / CompNominal Output Level: OUTPUT (L/PHONES, R/MONO): -10 dBuMaximum Output Level: OUTPUT (L/PHONES, R/MONO): +7 dBuOutput Impedance: OUTPUT (L/PHONES, R/MONO): 44 ohmsRecommended Load Impedance: OUTPUT (L/PHONES, R/MONO): 10 k ohms or greater (Phones: 44 ohms or greater)ControlsSCENE DOWN switch, SCENE UP switch, CTL1--2 switchesPART1--4 buttons, PART R button, EXIT button, WRITE button, MENU button, PAGE buttons1--4 knobs, SELECT knob, OUTPUT LEVEL knobDisplay: Graphic LCD 256 x 80 dotsConnectorsGK 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 typeOUTPUT (R/MONO) jacks: 1/4-inch phone typeCTL3, 4/EXP1 jack, CTL5, 6/EXP2 jack: 1/4-inch TRS phone typeUSB COMPUTER port: USB B type (supports High-Speed USB, USB Audio, and USB MIDI)USB MEMORY portMIDI connectors (IN, OUT)DC IN jackExternal Memory: USB Flash drive (sold separately)Power Supply: AC adaptorCurrent Draw: 840 mAPower Consumption when in OFF Mode (when the power automatically turns off): 0.2 WAccessoriesAC adaptor (PSB-1U + AC Cord Set)Quick StartLeaflet “USING THE UNIT SAFELY“Rubber foot x 4Options (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-ADFootswitch: FS-5U, FS-5L, FS-6, FS-7Expression Pedal: EV-30, FV-500L, FV-500H, Roland EV-5AC 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 WeightWidth246 mm9-11/16 inchesDepth134 mm5-9/32 inchesHeight63 mm2-31/64 inchesHeight (including rubber foot)65 mm2-9/16 inchesWeight (excluding AC adaptor)1.2 kg2 lbs 9 oz Boss GM-800 Guitar and Bass Synthesizer Multi-Effects Pedal.