The GT-1B 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 onboard 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-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 approximately seven hours of mobile playing time
  • Onboard control switch and expression pedal; footswitch/expression pedal jack and USB
  • Download pro patches and editor software for free at BOSS Tone Central

Boss GT1B Bass Effects Processor

$349.00 Regular Price
$331.55Sale Price

    Sampling Frequency: 44.1 kHz

    AD Conversion: 24 bits + AF method

    AF method (Adaptive Focus method) is a proprietary method from Roland & BOSS that vastly improves the signal-to-noise (SN) ratio of the AD and DA converters.


    DA Conversion: 24 bits

    Effects: 90 types

    Patches: 99 (User) + 99 (Preset)

    Phrase Loop: 32 sec.

    Nominal Input Level: INPUT: -10 dBu, AUX IN: -20 dBu

    Maximum Input Level: INPUT: +7 dBu, AUX IN: 0 dBu

    Input Impedance: INPUT: 1 M ohm, AUX IN: 27 k ohms

    Nominal Output: LevelOUTPUT (L/MONO, R): -10 dBu, PHONES: -10 dBu

    Output Impedance: OUTPUT (L/MONO, R): 1 k ohm, PHONES: 44 ohms

    Recommended Load: ImpedanceOUTPUT (L/MONO, R): 10 k ohms or greater, PHONES: 44 ohms or greater



    DOWN switch, UP switch CTL1 switch

    EASY SELECT button, EASY EDIT button, FX1/LIMITER button,

    OD/DS button, PREAMP button, FX2/MOD button, DELAY button, REVERB button, MEMORY EDIT button, EXIT button, ENTER button, MENU button

    1 knob, 2 knob, 3 knob

    Expression pedal


    Display: Graphic LCD (132 x 32 dots, backlit LCD)



    INPUT jack, OUTPUT (L/MONO, R) jacks: 1/4-inch phone type

    CTL2, 3/EXP2 jack: 1/4-inch TRS phone type

    AUX IN jack: Stereo miniature phone type

    USB COMPUTER port: USB type B

    DC IN jack


    Power Supply: Alkaline battery (AA, LR6) x 4, AC adaptor (sold separately)

    Current Draw: 200 mA

    Expected battery life under continuous use: Alkaline: Approx. 7 hours

    These figures will vary depending on the actual conditions of use.


    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



    Width: 305 mm (12-1/16 inches)

    Depth: 152 mm (6 inches)

    Height: 56 mm (2-1/4 inches)

    Maximum height: 74 mm (2-15/16 inches)

    Weight (including battery):1.3 kg (2 lbs 14 oz)

Castle Hill Store
Opening Hours

Monday to Friday: 9.30am - 6pm 

(School holidays: 5.30pm)  

Saturday: 9.30am - 4pm

Sunday: Closed

Rouse Hill Store

Opening Hours​

Monday-Friday: 9.00am - 5.30pm

Thursday: 9.00am - 9.00pm

Saturday: 9.00am - 5.00pm

Sunday: 10.00am - 5.00pm