From the Line 6 Website:
POD® XT Live Features

95 Stomp box and Studio Effects
42 Legendary and Classic Amp Models
24 Cab & 4 Mic models
128 Channel Memories
Stereo 1/4-inch analog Amp/Line Outs
Variax® Digital Input
Routing Options
Deep Editing
Built-in Chromatic Tuner
Large Backlit Display
Dedicated Stomp box On/Off Switches
Combination Wah/Volume/Tweak Pedal
Tap Tempo/Tuner Switch
Expression Pedal Input
Headphone Out
Aux Input for CD/MP3 players, drum machines, etc.
Full MIDI Support
USB Digital Recording I/O - Plus, Mac/PC editing with free Line 6 Edit™ or GuitarPort® software