BOSS GT-100 COSM Amp Effects Processor Review (June 2024)


Last updated on June 12, 2024 8:31 am Details


In this review post, we’re going to be discussing the BOSS GT-100 COSM Amp Effects Processor (GT-100), including an overview of its unique features.

Product Description

With the new GT-100 Version 2.0 update, BOSS’ high-end multi-effects processor is now even more powerful than before, adding a host of great new features to its already formidable arsenal. Two new amp types are included, along with cutting-edge MDP effects, an acoustic guitar simulator, and an improved rotary effect. A convenient Guitar-to-MIDI function is on board as well, letting you connect to a computer to play soft synths and input MIDI notes using your normal guitar. The GT-100’s USB audio capabilities have been expanded too, providing greater flexibility for re-amping applications. And with the BOSS TONE STUDIO software, you can now edit GT-100 patches from a friendly graphical interface on your computer.

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!

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 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.

Product Features

  • Advanced COSM amps that model vintage classics and deliver highly expressive tones
  • Dual LCDs and panel knobs offer simple and intuitive operation, with direct access to every parameter
  • EZ Tone feature with graphical Tone Grid for constructing new patches, plus Amp Customize and OD/DS Customize functions for easily creating original sounds
  • Unique Accel pedal provides simultaneous control of multiple parameters
  • Powerful A/B Channel Divider for creating dual amp and effects chains that can be blended together or toggled by footswitch, frequency, or picking strengthGT-100 Version 2.0—Newly Added Features
  • 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
  • Rotary 2 and Acoustic Guitar Simulator effects types added
  • Monophonic guitar-to-MIDI conversion from normal 1/4-inch guitar input
  • Enhanced USB audio/MIDI interface with multi-channel operation for flexible recording and 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

Pros & Cons


  • Solid build
  • Incredibly trusted
  • Favorable consumer reviews
  • Value for money
  • Terrific audio quality
  • Perfect for recording and live performances


  • Large in size
  • Quite Expensive
  • A graphical editor would be far superior to a software librarian

BOSS GT-100 COSM Amp Effects Processor Demo

Our Verdict

The GT-100 improves on the capabilities and practicalities of the GT series while being much easier to set up and use than its predecessors. It’s a terrific tonal resource for recording, with a wide selection of amp and effect sounds, and it’s also a very useful onstage unit.

You might not want to utilize the amp simulators live, but there are a plethora of effects available, especially in manual mode, which instantly converts the device from a patch-based multi-effects unit to a pedalboard full of individual stompboxes.

The BOSS GT-100 may be all you need between your guitar and amp, with eight stomps (or seven plus a tuner) and a wah/volume pedal.

Where to Buy

The best place to buy this product has to be Amazon, due to their competitive pricing and fantastic customer service.

BOSS GT-100 COSM Amp Effects Processor (GT-100)

as of June 8, 2024 10:53 pm

Pricing History

Price History for BOSS GT-100 COSM Amp Effects Processor (GT-100)


Current Price $489.88 June 8, 2024
Highest Price $489.88 December 22, 2023
Lowest Price $455.33 October 10, 2023
Since August 16, 2023

Last price changes

$489.88 December 22, 2023
$469.94 November 17, 2023
$455.33 October 10, 2023
$478.80 August 16, 2023

Last updated on June 8, 2024 10:53 pm

Buyers Guides This Product Is Featured In

Best Multi Effects Pedals

Additional information

Item Weight

11.2 pounds

Product Dimensions

27 x 7 x 15 inches

Item model number



1 AA batteries required. (included)

Is Discontinued By Manufacturer


Date First Available

February 13, 2012

Color Name

Assorted Colors




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