GuitarConnect Pro adds an instrument input to your iPad or iPhone. At one end, it gives you a 1/4 inch. mono instrument jack that fits your instrument cable, and at the other end, a 30-pin dock connector for your iOS device. Plug your instrument into the 1/4 inch. jack and you have a noise-free, 100% digital connection from your instrument directly into GarageBand. GuitarConnect Pro's gain control wheel lets you control the strength of your input signal.