Distortion, chorus, and more are all on hand, as are 9 bass-amp models that simulate classic combinations. Five effects can be chained at any time and in any order. You can save these effects in one of the 50 user preset patches. Switch among patches (or banks of patches) quickly with the tap of a toe, so you can change your live or studio sound with ease. You can also change global characteristics to retain a sense of unity among patches. A three-knob tone stack and the overall output level knob do not change as you cycle through your sounds.

The pedal sports 60 different effects, and you can edit or add more effects from your computer too. Simply hook the pedal up to your Mac or Windows machine over a USB cable and add effects from Zoom's Guitar Lab software.

The B1 Four provides one 1/4" instrument input, one 3.5mm input for mobile devices and media players, and a combined amp/headphone output. The unit runs on four AA batteries, giving you up to 18 hours of run time. You can also power the unit with a dedicated ZOOM AD-16 AC adapter or over USB.

Key Features at a Glance
Over 60 built-in effects
9 amp models for simulating classic rigs
Up to 5 effects can be used simultaneously or chained together in any order
Looper records up to 30 seconds (64 beats of CD-quality audio with seamless start and end times)
ZOOM Guitar Lab software for creating, editing, and managing effects and patches
68 built-in rhythm patterns, which can be used in conjunction with the Looper
50 memory locations for storing user-created patches
Auto Save function for automatic saving of all patch parameters
Onboard chromatic tuner supports all standard guitar tunings including open and drop tunings
Input jack accepts standard mono guitar cable
Both active and passive instruments are supported
Auxiliary input jack for connection of personal music players
Output jack for connection to amp or headphones
Runs on 4 AA batteries
Alkaline battery life of 18 hours
USB port for firmware updates, power, and connection to ZOOM Guitar Lab

Simultaneous Effects 5 Maximum
Patches 50 User Patches
Sampling Frequency 44.1 kHz
AD/DA Conversion 24-Bit, 128x Oversampling
Signal Processing 32-Bit, Internal
Display 128 x 32 Dot Matrix LCD
Input 1 x 1/4" TS Input, Phone Type
1 x 3.5 mm Auxiliary Input, Stereo, Phone Type
Input Level 1/4" Instrument: -20 dBu
3.5 mm Auxiliary: -10 dBu
Input Impedance 1/4" Instrument: 470 kOhms
3.5 mm Auxiliary: 1 kOhm
Output 1 x 1/4" TRS Output (Combined Line and Headphone Jack)
Maximum Output Level Line: +2 dBu
Headphones: 17 mW + 17 mW
Output Impedance Line: ≥10 kOhms
Headphones: 32 Ohms Load
Signal to Noise Ratio 120 dB
Noise Floor -97 dBu
AC Adapter 9 VDC, 500 mA, Center Negative (ZOOM AD-16)
Battery Power 4 x AA Batteries
Battery Life (approx.) About 18 Hours, Continuous Operation with Using Alkaline Batteries
USB MIDI: Micro-USB Type-B
When Using a Cable Designed only for Power, other USB Functions Cannot be Used
Dimensions 6.1 x 5.1 x 1.7" / 15.6 x 13.0 x 4.2 cm
Weight 12 oz / 340 g
Packaging Info
Package Weight 1.445 lb
Box Dimensions (LxWxH) 9.4 x 6.8 x 2.4"