Zoom B1X Four Bass Multi Effects Processor with Expression Pedal Speaker The feature that sets the A1 Two Of Us The feature that sets the Reflexion Filter Pro apart from the rest is its nine layer patented multi layer air gap technology 2 dedicated output streams for headphone monitoring ● B1X FOUR offers over 70 built in effects● 9 amp models for simulating classic rigs● Up to 5 effects can be used simultaneously 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● PRESELECT function allows silent patch selection while the current patch remains operational● Onboard chromatic tuner● Input jack accepts standard mono bass guitar cable (both active and passive instruments supported)● Auxiliary input jack for connection of personal music players● Output jack for connection to amp or headphones● Lightweight and small enough to fit in your gig bag● Easily integrated into any existing pedal board● Runs on 4 AA batteries