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Uncategorized · Boss

Boss GM-800 Guitar Synthesizer

The GM-800 is a guitar synthesizer that accepts GK pickup input and features polyphonic tracking alongside an extensive synthesis engine. It offers stereo output, MIDI connectivity, and buffered bypass switching.

  • 9V DC · center −
  • 840 mA
  • Stereo
  • MIDI
New
from $737.24
Used (asking)
from $648
Compare pricesSee specs

The rundown

Highlights

  • GK pickup input for guitar synthesizer tracking
  • Polyphonic synthesis capabilities
  • Stereo output with direct out option
  • MIDI support for expanded control
  • Runs on 9V DC (840 mA) with battery option

Best for

Guitarists seeking to integrate synthesizer sounds into their rig through dedicated pickup input and polyphonic tracking.

Quick facts

Power
9V DC
Current draw
840 mA
Polarity
Center negative
Dimensions
246.1 × 131.6 mm
Stereo
Yes
MIDI
Yes
Status
In production

Where to buy Boss GM-800 Guitar Synthesizer

$737.24 lowest new price · Reverb

Used listings asking $648–$904, median $758 (3 listings, small sample). Asking prices, not sold prices.

Current offers
SellerConditionPriceLink
ReverbUsed$648View
ReverbNew$737.24View
ReverbUsed$758View
ReverbNew$846.99View
ReverbNew$846.99View
ReverbNew$846.99View
ReverbNew$846.99View
ReverbNew$846.99View
ReverbNew$846.99View
ReverbNew$846.99View

Prices last checked 20 hours ago. Links to sellers are affiliate links.

Frequently asked questions

What power supply does the GM-800 require?

The GM-800 runs on 9V DC with 840 mA current draw and is center-negative, with battery operation also supported.

Does the GM-800 support MIDI?

Yes, the GM-800 includes MIDI connectivity for controlling external instruments and devices.

What type of bypass switching does it have?

The GM-800 features buffered bypass switching.

Similar pedals

Same type, similar features.

Specs from pedalfilter. Summary written by PedalBro from those specs and public descriptions.

Page last updated September 29, 2026.