General setting, Setting the clock display (clk mode), Connecting an mp3 changer (play mode) – Alpine IDA-X303 User Manual
Page 24: Sound (beep) guide function, Turning mute mode on/off (int mute), Setting the aux+ mode, Setting the aux+ name mode, Setting the aux mode (v-link), Setting the changer name, Setting the external digital input (digital aux)

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