This interface is compact, fast, and gives you 32 MIDI channels!

E-MU's Xmidi 2x2 is a compact, plug-and-play USB MIDI interface that provides you with two ultra-fast MIDI inputs and outputs (32 MIDI channels in/outs total), allowing you to connect multiple MIDI devices to your computer. The Xmidi 2x2 features bus-powered operation for total portability, and provides you with status indicators for each MIDI input and output. The Xmidi 2x2 also ships with a handy carrying pouch to protect it in transit.

E-MU Xmidi 2X2 USB MIDI interface Features:

2 MIDI ins / 2 MIDI outs
USB 1.1
USB bus-powered
Ultra-fast MIDI response
Active-Sensing messages filtered
MME, DirectMusic and CoreMIDI supported
Multiple device support

E-MU Xmidi 2X2 USB MIDI interface Specifications:

Minimum System Requirements
PC:
Microsoft Windows XP SP2 or greater or Windows XP x64
Intel or AMD processor - 600MHz or faster
128MB System RAM
1 available USB port
CD-ROM or DVD-ROM drive

Macintosh:
Apple Macintosh OS X 10.3.9 or greater
450MHz G4 processor or faster
128MB System RAM
1 available USB port
CD-ROM or DVD-ROM drive (for manual)

E-MU Xmidi 2X2 USB MIDI interface Includes:

E-MU Xmidi 2x2, USB Cable (2-meters), Carrying pouch, Owner's Manual, E-MU Software/Manual CD-ROM with: Windows XP and x64 Drivers, Owner's Manual PDF