FC-22 Guitar/Bass to Smarphone converter is the easiest way to input your instruments signal into a Smarphone or Tablet. Just plug the FC-22 into the device’s headphone jack, you instrument into the FC-22 and Connect the output of FC-22 to an amplifier or another device that has line input; Like a mixer, keyboard, or a synthesizer. If you listen to the sound through headphones, the output jack will automatically mute.