RapCo Horizon iJam 3-N-1 BoxThe 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