Boss GT-1B Bass Multi-Effects Processor

Backed by Boss's flagship sound engine, the GT-1B gives bass players full access to pro-level amps and MDP effects in a light, compact floorboard unit.

The Boss GT-1B Bass Multi-Effects Processor gives bass players a massive range of pro tone-shaping power in a small and robust package. Backed by Boss's flagship sound engine, you have full access to a huge selection of bass-optimized amps and effects for stage and studio playing. The streamlined interface lets you dial in sounds fast, while the on-board control switch and expression pedal enable you to adjust multiple effects in real time. And by connecting to Boss Tone Central, you can download new patches, editing software, and more. Compact, rugged, and battery powered, the GT-1B is the ultimate mobile tone companion for every bassist.

Flagship Tone Tools for Bass

Equipped with a bass-tuned version of Boss's most advanced sound engine, the GT-1B is absolutely packed with top-quality sound tools. A wide range of preamps are available for shaping your core tone, including updated favorites from the GT-10B and two all-new models. Premium MDP effects like limiter and distortion feature advanced Boss tech to maintain your instrument's character and response, enabling free-flowing musical expression. Graphic EQ, T-Wah, and other essentials are on hand too, plus impact effects such as Harmonist, Bass Synth, Defretter, and more. There's also a complete array of mod, delay, and reverb effects, and even a looper for jamming and on-the-fly creativity.

Mobile Powerhouse

The GT-1B is designed for bassists on the move. It's surprisingly lightweight and compact, making it ideal read more for tight stage setups and situations where you need to travel light. The rugged modern design is easy to slip in the accessory compartment of a bass bag, with no worries of hard edges causing damage to your instrument. AC or battery power provides flexibility for any performing situation, so you can always take your tone with you everywhere you play.

Sound Creation Made Easy

With the GT-1B's intuitive interface, it's simple to build sounds and fine-tune parameters, even if you're new to multi-effects. Dedicated buttons provide instant editing access to each effect category, which you can adjust straight away via three panel knobs. The buttons also function as on/off switches, and feature status indicators that let you see which categories are enabled at a glance. Easy Select and Easy Edit functions streamline patch creation even more, allowing beginners and pros alike to achieve polished multi-effects sounds with just a few tweaks.

Boss Tone Central and Boss Tone Studio

At Boss Tone Central, you'll find a wide selection of free patch collections for the GT-1B. Programmed by top bassists, these patches are dialed-in and ready to use, and make great starting points for advanced players who like to create their own custom sounds. The free Boss Tone Studio software provides a full-featured editor/librarian for the GT-1B, as well as integrated access to all the patch collections at Boss Tone Central.

Pro Control in a Compact Space

The GT-1B's three footswitches are smartly designed to provide patch selection, tuner access, looper control, and more in a minimal footprint. The dedicated CTL1 switch is freely assignable to functions like tap tempo, effects on/off, and numerous others, while the expression pedal and toe switch are assignable to volume, wah, pitch shift, and various effects parameters. If you crave even more control, there's a jack for connecting up to two external footswitches or an expression pedal. And in addition to providing access to Boss Tone Central and Boss Tone Studio, the GT-1B's USB jack lets you record tones directly to your favorite DAW.


- Flagship-class Boss sound engine specially tuned for bass
- Pro-level amps and effects in a light, compact floor unit
- Essential tools on board for optimizing your core bass tone
- Includes advanced MDP effects for maximum musical expression
- Modern design with no hard edges enables safe transport in an instrument bag
- Easy Select and Easy Edit functions for quickly choosing and tweaking patches
- Four AA batteries provide up to seven hours of mobile playing time
- On-board control switch and expression pedal; footswitch/expression pedal jack and USB
- Download pro patches and editor software for free at Boss Tone Central
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- Width: 12-1/16 inches
- Depth: 6 inches
- Height: 2-1/4 inches
- Maximum height: 2-15/16 inches
- Weight (including battery): 2 lbs 14 oz

- Owner's manual
- Alkaline battery (AA, LR6) x 4

Options (sold separately)
- AC adaptor: PSA series
- Footswitch: FS-5U, FS-5L, FS-6, FS-7
- Expression Pedal: FV-500L, FV-500H, EV-30, Roland EV-5
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 4 lbs
Shipping Dimensions: 15 x 9 x 5 in
Manufacturer Part Number (MPN): GT-1B

For support or warranty questions, please contact the manufacturer:
Phone: 323-890-3700

Reviewers gave this product an overall rating of 3 out of 5 stars. (3 ratings)
Submitted November 27, 2017 by JA M in Birmingham, AL

"Boss GT-1B"

Overall: 3 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
It's awesome, simply awesome. The size factor alone makes it a winner for me. What makes it a loser for me is that Boss did not include the dang power supply. Sure, I can and will (because I have to) order a PSA 120S 500mA power supply for this unit for @ $30.00, but if Boss was halfway thinking this through it probably would cost the consumer far less. All in all, zZounds was off the chain as far as customer service and speed in getting this little adapter-less piece of Heaven to me where Musician's Friend had me on hold for 7 minutes then hung up on me. 3 stars overall because of no included power supply. What were they thinking?

Musical Background:

Former audio engineer @ Soul Asylum Studios Bham. Bass player for The Other Day and Alamantra.

Musical Style:

From hip hop with the "Deep End" to hard core reggae with "dubmassivereggae" to the sweet bossa nova sounds of The Other Day, I
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