if you listen to the sound through headphones,the output jack will automatically mute.
The 6.35mm input jack is designed for guitar,bass and also applicable for keyboards,
microphones mixers etc.
The 6.35mm output jack can beconnected to an amplifier
A3.5mm stereo headphones jack
The 3.5mm input plug connects to your Iphone
Compatible with apps:effects,tuners,metronomes,tone generators,recorders,amps etc