BOSS GT-100 top front angle
BOSS GT-100 rear view
BOSS GT-100 knobs close up
BOSS GT-100 on stage
BOSS GT-100 top front panel


COSM Amp Effects Processor

Product Highlights

  • COSM Amp Effects Processor
  • Models vintage classics and delivers never-before-heard tones
  • Dual LCDs and panel knobs offer simple and intuitive operation
  • Direct access to every parameter
  • EZ Tone feature with graphical Tone Grid for constructing new patches
  • Unique Accel pedal provides simultaneous control of multiple parameters
  • Two new amp models: BGNR UB Metal and ORNG Rock Reverb
  • New MDP effects powered by innovative BOSS technology: Tera Echo, Overtone, and A-DIST

Sale Price $499.00
Retail Price $699.00
You save $200.00


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BOSS GT-100 COSM Amp Effects Processor

The BOSS GT-100 Version 2.0 offers full Power for both stage and studio. With the new Version 2.0 update, BOSS’ flagship multi effects processor is more powerful than ever, adding a list of awesome new features to its already excellent lineup. Two new amp types are included, in addition to highly-advanced MDP effects, an acoustic guitar simulator, and an enhanced rotary effect. A convenient Guitar to MIDI function is also featured, allowing you to enjoy Guitar Friend Jam and other computer software using your regular guitar. The GT-100’s USB audio capabilities have also been enhanced, delivering more versatility for re-amping applications. And with the BOSS TONE STUDIO software, you can now edit GT-100 patches from a user-friendly interface on your computer. You may also be interested in the The GT-001, which brings BOSS's flagship GT Power to your desktop. The GT-001 features the highly-acclaimed amps and effects of the flagship GT-100 Version 2.0 in a sleek desktop processor for your home studio or mobile setup.



Boss GT-100 Key Features:

  • Advanced COSM amps that model vintage classics & produce never-before-heard tones
  • Dual LCDs & panel knobs provide simple and intuitive operation, with direct access to every parameter
  • EZ Tone feature w/ graphical Tone Grid for making new patches, plus Amp Customize and OD/DS Customize functions for easily crafting original sounds
  • Special Accel pedal allows for simultaneous control of various parameters
  • Powerful A/B Channel Divider for creating dual amp & effects chains that can be merged together or toggled by footswitch, frequency, or picking intensity

GT-100 Version 2.0—Newly Added Features    

  • 2 new amp models: BGNR UB Metal & ORNG Rock Reverb
  • New MDP effects powered by cutting-edge BOSS technology: Tera Echo, Overtone, and A-DIST
  • Rotary 2 and Acoustic Guitar Simulator effects types added
  • Monophonic guitar-to-MIDI conversion from normal 1/4" guitar input
  • Enhanced USB audio/MIDI interface w/ multi channel operation for versatile recording & efficient re-amping
  • Support for BOSS TONE STUDIO editor/librarian for Mac/Windows and new GT-100 Version 2.0 patches, available for free at
  • Version 2.0 software available as a free download for all GT-100 owners

Advanced COSM Amps: Beyond Vintage

With its next-generation COSM processor, the GT-100 ushers in a new era of expression and sonic capabilities. Recreating the meticulous details of vintage amps and how they behave, the GT-100 excels in not only cloning classic amps, but in creating a new world of unimagined tones as well. The Amp Customize function lets you mutate classic amps beyond reality to construct completely new, unimagined sounds!

Simple and Intuitive User Interface

The GT-100’s unique dual-LCD and eight-knob user interface provides fast access and intuitive control. There are no menus to navigate; every function is instantly available. The tone-customizing functionality has been improved as well—all patches, amps, and overdrives/distortions can be created from scratch and/or customized with the friendly graphical Tone Grid.

New Tonal Possibilities with the Accel Pedal

A new dimension of expression is available with the Accel pedal, which enables control of multiple parameters simultaneously, as well as time-variant effects such as Feedbacker, S-Bend, Twist, and more. Experiment with creative combinations of parameters and bring dynamic new sounds to your performances by interacting in real time with this cool pedal.



A/B Channel Divider Function

Another notable feature in the GT-100 is the versatile A/B Channel Divider. This lets you assign different amps and effects to each channel, either for blending together or switching between them with a footswitch. Going even further, you also have the ability to switch channels by playing strength or frequency range. With each channel capable of driving its own effects and amps settings, the range of tones gets wider and wilder! You can assign smooth, mild lead tones to the mid-to-high pitches, for example, and heavy, cutting tones to the lower notes—the tonal possibilities are endless.

Edit and Organize Sounds with BOSS TONE STUDIO

Available as a free download for Mac or Windows, BOSS TONE STUDIO gives you an intuitive graphical interface for creating and editing GT-100* effects patches from your computer via USB. The software also makes it easy to organize and archive patches, and to load them as needed for different gigs and recording sessions. If your computer has Internet access, BOSS TONE STUDIO provides an integrated connection to the BOSS TONE CENTRAL website, where you can preview and download free gig-ready patches created by top guitar pros directly into the GT-100. *GT-100 Version 2.0 software is required for compatibility with BOSS TONE STUDIO.

BOSS TONE CENTRAL: Your Web Home for Free Patches, Instructional Vids, Artist Tips, and More

BOSS TONE CENTRAL is the ultimate destination for all players that use BOSS products. Evolving to include a growing selection of BOSS gear, this newly launched site gives you access to lots of premium content, including demo videos and free patches created by famous guitarists, touring pros, and session players. Check back often for new patches, how-to videos, artist interviews, and much more. If you love BOSS effects, BOSS TONE CENTRAL is the place to be!

Boss GT-100 COSM Amp Effects Processor

AD Conversion:

  • 24 bits + AF method (*1)    

DA Conversion:

  • 24 bits    

Sampling Rate:

  • 44.1 kHz    

Program Memories:

  • 400: 200 (User) + 200 (Preset)    

Nominal Input Level:

  • INPUT: -10 dBu
  • RETURN: -10 dBu
  • AUX IN: -20 dBu    

Input Impedance:

  • INPUT: 1 M ohm
  • RETURN: 100 k ohms
  • AUX IN: 47 k ohms    

Nominal Output Level:

  • OUTPUT: -10 dBu/+4 dBu
  • SEND: -10 dBu    

Output Impedance:

  • OUTPUT: 2 k ohms
  • SEND: 2 k ohms    

Dynamic Range:

  • 100 dB or greater (IHF-A)    


  • Graphic LCD (132 x 64 dots, backlit LCD) x 2    


  • INPUT jack (1/4-inch phone type)
  • AUX IN jack (Stereo miniature phone type)
  • OUTPUT L/MONO, R jacks (1/4-inch phone type)
  • PHONES jack (Stereo 1/4-inch phone type)
  • EXT LOOP jacks (SEND, RETURN; 1/4-inch phone type)
  • AMP CONTROL jack (1/4-inch phone type)
  • SUB CTL1, 2/SUB EXP jack (1/4-inch TRS phone type)
  • USB port
  • MIDI connectors (IN, OUT)
  • DC IN jack    

Power Supply:

  • DC 9 V    

Current Draw:

  • 600 mA    


  • AC Adaptor
  • USB Cap
  • Owner’s Manual    

Options (sold separately):

  • Footswitch: BOSS FS-5U
  • Dual Footswitch: BOSS FS-6, BOSS FS-7
  • Expression Pedal: BOSS FV-500L/500H, Roland EV-5    



  • 542 mm
  • 21-3/8 inches    


  • 271 mm
  • 10-11/16 inches    


  • 80 mm
  • 3-3/16 inches    


  • 4.8 kg
  • 10 lbs. 10 oz.

Call 1-877-477-6432 for any technical questions or if you need SPECIAL PRICING regarding this product