Abstract: An audio device includes an audio output, a single controller, and a processor. The audio output is operable to output at a volume level. The controller is operable to receive a command from a user. The processor is operable to process the received command to provide one of multiple audio control functions that control the audio output. The multiple audio control functions include: a play mode, a pause mode, and a volume change mode. One of the multiple audio control functions is selected in response to comparing a pressing time of the controller with a first predetermined time period. The audio output is operable to output at a volume level during the play mode, to mute during the pause mode, and to the output volume level to be adjusted during the volume change mode.