trying to decide which one to get... what exactly does the expression pedal do?

The expression pedal offers several functions. Yes, it can adjust volume or be used as a wah but it can also adjust intensity of effects. It's nice to be able to adjust the amount of overdrive or phaser, etc.., for example, with your foot. You can use it to adjust the pitch when using that effect.

Can i use it with an ukulele because i'm a bass and ukulele player. Also can we connect it to an audio digital interface like focusright Scarlett?

Yes you can connect it to focusrite interface, I don’t know for sure if a ukulele will work with the bass processor since if mainly for the bass guitar.

Unit won't stay powered on for more than a second when under battery power, second one I ordered with same problem, purchased end of August 22.

Use the android plug, it works great for hours, don't drop anything on it, falls, or spills she's easy to bust

How do you get the device that you plug in to play music through Zoom(such as phone) to play in stereo? I can only get mine to play mono.

You must be plugging your phone in with a mono cord, I would try a different aux cable.

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🎶 Elevate your bass game with endless tones and total freedom!

LOOP LIKE A PRO - 30-second looper lets you build complex grooves on the fly—perfect for practice or performance.
ON THE GO POWER - Battery-powered design means you can rock anywhere, anytime—no outlet needed.
STAY IN THE GROOVE - 68 built-in rhythm patterns keep your timing tight and your jams fresh.
PLUG PLAY VERSATILITY - Standard guitar input plus aux input and amp/headphone output for seamless integration.
UNLEASH YOUR SIGNATURE SOUND - Over 70 built-in effects and 9 amp models to craft your unique bass tone.

The Zoom B1X Four is a compact, battery-powered bass multi-effects processor featuring 71 built-in effects, 9 amp models, a 30-second looper, and 68 rhythm patterns. With USB connectivity and versatile input/output options, it’s designed for bassists seeking professional sound shaping and portable performance.

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Item Weight	835 g
Product Dimensions	15.75 x 21.59 x 5.08 cm; 834.61 g
Batteries	4 AA batteries required.
Item model number	B1X FOUR
Color Name	Red
Connector Type	USB
Hardware Interface	USB
Signal Format	Analog
Battery type	Alkaline
Power Source	Battery Powered
Voltage	9 Volts

Zoom B1X Four Bass Multi-Effects Processor With Expression Pedal, With 70+ Built-In Effects, Amp Modeling, Looper, Rhythm Section, Tuner, Battery Powered

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