Fender Mustang I & II Tuner The Fender Mustang has a built-in Tuner mode that turns the control panel LEDs into a Chromatic Tuner. To access the Tuner mode, press and hold the Tap button for two seconds. The Exit and Tap buttons will illuminate. Be sure that the volume knob on your guitar is turned up to 10. Strike any string. Use the LEDs to tune. The Green LED indicates that the string is in tune.
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