You need phantom power
I don't see anything about phantom power in the specs. Are you going though a mixer or preamp before the Edirol? If not, you'll need some source of power for the B1. It won't work otherwise.
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24 bit, USB Bus-powered, MIDI and Audio Combo Interface
The UA 20 brings portable 24 bit quality to your Mac or PC applications. Your laptop audio is now 24 bit resolution, powered by your computer through the USB bus, and flexible! Connect your guitar, mic and line level input with Edirol's new portable, affordable UA-20 USB MIDI/Audio Interface.
Main Features
* A complete USB audio recording device of high-definition with 24-bit AD/DA conversion.
* Low latency with Direct Monitoring function
* Direct Monitoring function allows for low latency performance while recording.
* ASIO 2.0 (Win/Mac), MME, WDM drivers and Sound Manager (Mac) compatibility
* Create with any music software program for Mac or PC. It’s compatible with any audio production software and optimized for ASIO or WDM compatible music software for your music creation.
* Fast and stable MIDI input/output with FPT
* USB bus powered, adaptor free
* USB connection supplies power as well as data
* Headphone (1/8”) jack and headphone volume
Features
Audio/MIDI Interface
Portable
Channels
1 stereo record
1 stereo playback
Full duplex
Signal Processing
AD/DA 24-bit
Sample Rate
Digital Out 44.1 kHz
Audio driver compatibility
ASIO2.0 (Win/Mac), WDM,
MME, Sound Manager
Inputs
Line/Guitar/Mic x 2
Outputs
Line (RCA pin) x 2
S/P DIF Optical
Headphone
MIDI Interface
IN x 1/OUT x 1
System Requirements
Macintosh
* MacOS 8.5, 8.6, 9.x and OS X
* USB ready Apple Macintosh
* PowerPC G3/233 MHz or higher
* 64 MB RAM or more
* OMS 2.3.3 or later. FreeMIDI 1.35 or later.
Windows
* Microsoft Windows Me/98/98SE/2000/XP
* Windows compatible equipped with a USB* port
* Pentium Processor 200 MHz or higher
* 32 MB RAM or more
* Must have a compatible USB host controller.