Psvr2 Does not have sound buttons or a mute button on the headset. You will have to use the onscreen ui. This was confirmed by multiple people at ces including Myles from
I set up my PSVR, but it won't turn on and the PS4 thinks the headset isn't plugged in. It also doesn't have an inline remote but there is a few buttons
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How to alter the volume on the PlayStation VR 2 headset
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You can completely remap the PSVR 2 controller buttons : r/PSVR
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PSVR 2 Hands-on: Big Improvements Coming to Sony's Next VR Headset
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Walkabout Mini Golf™ coming to PSVR2! — Mighty Coconut
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PSVR 2 Complete Guide - Everything We Know About PlayStation VR 2 - PlayStation Universe
PSVR2 review: Sony nailed the hardware this time | Mashable
Sony has shown off their PSVR2 Controllers, highlights below: 1⃣ Finger Touch Detection 2⃣ Haptic Feedback 3⃣ Adaptive Triggers 4⃣ Tracking 5⃣ Action... | By 3-Bit | Facebook
What's inside the Playstation VR 2 box
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PSVR 2 beginner's guide: Tips and tricks for Sony's VR headset