[DISCONTINUED] Vox APJS amPlug Joe Satriani Guitar Headphone Amp Joe's signature lead tone with your choice of delay on or off Distortion tone with superb dynamic response, inspired by the Satchurator Analog-style delay with Joe's filter and EQ, inherited from the Time Machine Plugs straight into your electric guitar, so you can instantly enjoy great sound through your headphones Convenient and portable with up to 11 hours of battery operation