Fender Mustang GTX Series Owner's Manual page 45

When finished playing the first musical passage, go into overdub mode by stepping on FUNCTION button
2 (yellow arrow in illustration below). The red FUNCTION LED above the button will begin flashing and the
DISPLAY WINDOW will show "DUB, " indicating that the LOOPER is now in overdub mode and a second musi-
cal passage can be recorded over the first (overdub mode can also be activated during playback of the first
passage by stepping on FUNCTION button 2). Continue overdubbing musical passages as often as desired.
After an overdub is recorded, step on FUNCTION button 3 (green arrow in illustration below) to start playback
of all recorded parts; press FUNCTION button 4 (blue arrow in illustration below) to stop playback.
While recording, playing back or stopped on the first musical passage, the user can undo the recording if de-
sired by stepping on FUNCTION button 5 (yellow arrow in illustration below), labeled "UNDO. " When doing so,
recording will stop, the red FUNCTION LED above the button will illuminate and the DISPLAY WINDOW will
show the mode is currently in use ("REC" in the illustration below). Once overdubs have been added, however,
the UNDO function applies only to the last overdub recorded; preceding overdubs cannot be undone.
43