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Make sure your external audio device is connected to the “aux in” jack on the back of the TravelTunes (not the headphone jack), using a 1/8”(3.5mm) “male to male” stereo cable (not included) plugged into the line out or headphone output of the audio device. Make sure the audio device is turned on and playing. Set the volume on the audio source to mid-level, and start with the volume set low on the TravelTunes, gradually increasing it to the desired level. If sound quality is poor, reduce the vol