Can the Boss GT-1B be powered via USB alone when connected to a computer, or does it require an external power supply for full functionality, including audio interface features?

Yes, the Boss GT-1B can be powered via USB when connected to a computer. You do not need an external power supply for full functionality, including using its audio interface features.

Can the Boss GT-1B’s aux input be routed through the effects chain, or does it only pass the signal directly to the output?

The Boss GT-1B’s aux input is designed to pass the signal directly to the output and cannot be routed through the effects chain. This input is mainly for playing along with external audio sources, such as a smartphone or music player, and effects processing is not applied to the aux input signal.

Boss GT-1B Bassguitar Multi-Effect

4.90

19 x rated

Brand: Boss

Product code: 246228 (GT-1B)

Boss GT-1B Bassguitar Multi-Effect

4.90

19 x rated

Brand: Boss

Product code: 246228 (GT-1B)

€326

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326 points

Boss GT-1B Bassguitar Multi-Effect

€326

Тype: Multieffect
Number of Effects: 90
USB: Yes
MIDI Interface: No
Inputs: AUX IN, FS, Mono
Outputs: Headphone Jack 3,5mm, Mono, Stereo, USB

Description
Parameters and specifications
Recommended accessories
Reviews (19)
Questions and answers (2)
Documents

Boss GT-1B Bassguitar Multi-Effect

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.

Features
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

I have a remark regarding the description

Тype: Multieffect

Multieffect is a device that combines multiple effects into a single unit. It allows players to switch between various sound effects - such as distortion, delay, reverb, modulation, or dynamics - and often includes the ability to create and save custom presets. Multieffects are popular for their versatility, compact design, and convenience in both live performance and studio use.

Controls

FS
Expression
Easy
Menu
Effect
Select Knob
Write
Memory Edit

Battery Operation: Yes

Battery power provides flexibility and mobility. This feature allows you to use the device anywhere, even in places where an electrical outlet is not available. Battery power is ideal for situations that require portability and independence from the grid, whether you're outdoors, on the road, or in a location with limited access to electricity.