The ZBox from MOTU is a guitar pickup impedance adapter that allows for connecting an electric guitar or bass to a computer audio interface without losing tone. Today's guitar amp modeling plug-ins are amazing in their ability to faithfully model real guitar amplifiers. However, 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. The ZBox matches the output impedance ("Z") of your guitar to the impedance of a non-amp input, such as the microphone/instrument preamp input on your audio interface. Without proper impedance matching, your guitar won't sound natural or "feel right". The authentic matching circuits emulate the 2-jack switching network found on many classic amplifiers, complete with analog simulation of the input tube grid. To support a wide range of guitars, the ZBox provides authentic "Hi-Z" and "Lo-Z" inputs, just like the ones found on many classic guitar amplifiers.