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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B1X Four Bass Multi-Effects with Expression Pedal & 70+ Effects

Product ID: 105200324

Details

Brand
Zoom
Color
Red
Item Weight
1.8 pounds
Product Dimensions
6.2"L x 10"W x
Style
B1X FOUR

🔄Looper + 68 rhythm patterns

🎚️Expression pedal for real-time control

🎛️70+ effects & 9 amp models

$278.17

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Description

🎸 Elevate your bass game with pro-level effects and total control!

ONBOARD CHROMATIC TUNER - Stay perfectly in tune anywhere, anytime—no distractions, just pure bass.
SIMULTANEOUS 5 EFFECT CHAIN - Mix and match effects in any order to create truly unique soundscapes.
DYNAMIC EXPRESSION PEDAL CONTROL - Shape volume, wah, delay, and pitch live for electrifying performances.
UNLEASH 70 EFFECTS 9 AMP MODELS - Craft your signature bass tone with endless sonic possibilities.
BUILT IN LOOPER 68 RHYTHM PATTERNS - Jam, practice, and layer without extra gear—your personal rhythm section.

The Zoom B1X FOUR is a compact, battery-powered bass multi-effects pedal featuring over 70 effects, 9 amp models, a built-in looper with 68 rhythm patterns, and an expression pedal for real-time sound shaping. Designed for bassists seeking versatile, stage-ready tones and seamless practice tools, it also includes a chromatic tuner and USB connectivity for easy effect downloads and updates.

Specifications

ASIN	B07MZQNKYQ
Amperage	9 A
Audio Output Effects	Auxiliary
Best Sellers Rank	#6,476 in Musical Instruments ( See Top 100 in Musical Instruments ) #18 in Electric Guitar Floor Multieffects
Brand	Zoom
Brand Name	Zoom
Color	Red
Connector Type	USB Micro-B
Controls Type	Knob, Button, Footswitch
Customer Reviews	4.6 out of 5 stars 1,222 Reviews
Global Trade Identification Number	00884354020705
Hardware Interface	USB
Included Components	User manual, Expression pedal (possibly)
Item Dimensions	6.2 x 8.5 x 2 inches
Item Dimensions L x W x H	6.2"L x 10"W x 2"H
Item Highlight	Amp Modeling, Looper, Rhythm Section, Tuner, Battery Powered
Item Type Name	Bass Multi-Effects Pedal
Item Weight	1.8 pounds
Manufacturer	Zoom
Manufacturer Part Number	B1X FOUR
Model Name	B1X FOUR
Model Number	B1X FOUR
Number of Items	1
Power Source	Battery Powered
Product Dimensions	6.2"L x 10"W x 2"H
Signal Format	Analog
Style	B1X FOUR
UPC	884354020705
Unit Count	1 Count
Voltage	9 volts
Warranty Description	1 year - replacement.

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