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The GT-1B gives bass players a massive range of pro tone-shaping power in a small and robust package. Backed by BOSS’s premium 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.

Boss gt-1B bass effects processor

SKU: gt-1b

    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


    90 types


    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 Level

    OUTPUT (L/MONO, R): -10 dBu, PHONES: -10 dBu

    Output Impedance

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

    Recommended Load Impedance

    OUTPUT (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


    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)