Today's guitar amp modeling plug-ins are simply amazing in their ability to faithfully model real guitar amplifiers. From IK Multimedia's Amplitube, to Waves, to Native Instruments, to Line 6, to Digital Performer's included Custom '59, you can plug your guitar directly into your audio interface, dial up a guitar tone in your plug-in software, and play. The sound is simply stunning. But wait. They're all missing something. In fact, they're missing a crucial element of the signal path that simply cannot be modeled in software: the proper input impedance of a real guitar amplifier. When you plug your guitar into your audio interface, the interface's impedance does not match the typical levels found on a real guitar amplifier. The result? No matter how hard you try, you'll never quite be able to replicate the true sound and "feel" of playing into a real guitar amp. The sound will be just a little more thin and unresponsive than the real thing. The solution? ZBox!