The i-JAM 3-n-1 is a must have for the performer using electric instruments. It provides the player with 3 interfacing solutions in one small, portable package.
The i-Phone Instrument Interface is for use with applications such as amplifier models, recording software apps, or guitar instructional apps, just to name a few. The built-in amplifier allows continuous monitoring for the applications that do not provide this function internally.
The Practice Amplifier needs no other interface. Just plug