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Not a hidden feature but a bit of convenience, USB music player volume adjustable in PS Menu (holding the PS button) : r/PS4
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Amazon.com: ASHATA Bluetooth Dongle Adapter USB 2.0, Mini Dongle Receiver and Transmitters Wireless Adapter Kit Compatible with PS4 /PS5 Playstation 4 /5 Support A2DP HFP HSP : Video Games
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