Not a hidden feature but a bit of convenience, USB music player volume adjustable in PS Menu (holding the PS button) : r/PS4
PS4 System Software 2.00 Preview: USB Music, Home Screen Colors – PlayStation.Blog
How to Play Music on a PlayStation 4: 10 Steps (with Pictures)
Amazon.com: Cosycost USB Microphone,Condenser Computer PC Gaming Mic for PS4/5 Laptop Windows Mac OS Android Phone,Noise Cancelling Instant Mute,Studio Mic for ASMR,Voice,Music Recording,Podcasting,Streaming : Musical Instruments
PlayStation 4 system update adds USB background music | Eurogamer.net
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
How to Play Local Video and Music Files on Your PlayStation 4
PS4 Firmware Update 3.00: Sony Has Removed The USB Music Player
![How to Download Amazon Music to USB [Updated Recently] - TuneIf](https://www.tunelf.com/wp-content/uploads/2020/07/play-spotify-on-ps4-with-usb-1024x553.png "How to Download Amazon Music to USB [Updated Recently] - TuneIf")
How to Download Amazon Music to USB [Updated Recently] - TuneIf
PS4 Pro Tip: Using Your iPod With The PS4′s USB Music Player | N4G
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
![PlayStation 4 USB Music Player is back! | HOW TO [PS4 Firmware 3.50] - YouTube](https://i.ytimg.com/vi/PkQttiAESgc/maxresdefault.jpg "PlayStation 4 USB Music Player is back! | HOW TO [PS4 Firmware 3.50] - YouTube")
PlayStation 4 USB Music Player is back! | HOW TO [PS4 Firmware 3.50] - YouTube
Listening to music on a USB storage device | PlayStation®4 User's Guide
1mii B10 Usb Bluetooth-compatible 5.0 Transmitter Aptx Ll Hd Music Driver Free Usb Bluetooth Adapter For Pc Ps4 Game Console - Wireless Adapter - AliExpress
PS4: How To Set Up and Use The USB Music Player App!! - YouTube
How to Play Videos, Music, and Photos on Your PS4 | Gadgets 360
How to Play Music on a PlayStation 4: 10 Steps (with Pictures)
How to Play Music on a PS4 With Spotify or a USB Drive
Mercase USB Condenser Microphone Compatible with PC/MAC/Ps4/iPhone/iPa — ColorMyPods
How to Play Your Music on The PS4 - PS4 Home
PS4: How to Use USB Music Player - YouTube
How to Play Local Video and Music Files on Your PlayStation 4
PS4 Media Player review - Wololo.net
PS4 update rolls out USB music player, Share Play next week | Engadget
