Fender Mustang GT40 GT100 GT200 User Manual AUXILIARY AND HEADPHONE JACKS

The Mustang GT control panel features two 1/8”-inch jacks—an auxiliary input for connecting external mo-bile/audio devices and an output for convenient headphone use.

Note that when using the auxiliary input, volume levels for external devices are set using volume controls on the external devices themselves (the amp’s volume controls are for overall volume level only and do not affect individual volume of external devices connected to the auxiliary input jack). Also note that when headphones are plugged in, speaker output is muted.