Reducing ambient noise without playing back music [Quiet Mode] (NWZ-E573/E574/E575 only)
You can use the Noise Canceling effect to obtain some peace and quiet.
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Connect the supplied headphones to your Walkman, and from the Home menu, select [Noise Canceling] [Noise Canceling: On/Off] [On].
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From the Home menu, select [Noise Canceling] [Quiet Mode].