BlackShark V2 HyperSpeed / Synapse 4 – Mic volume stuck at 0 after mute/unmute

Hi,

I’m having a persistent microphone issue with my Razer BlackShark V2 HyperSpeed when using Razer Synapse 4 on Windows.

Environment

• Headset: Razer BlackShark V2 HyperSpeed (wireless dongle, 2.4 GHz)

• Software: Razer Synapse 4 (latest version as of today)

• OS: Windows 11 (fully updated)

• Connection: Dongle plugged directly into the PC (rear USB port)

• Default input device in Windows: “Microphone (Razer BlackShark V2 HS 2.4)”

Issue summary

When Synapse 4 is running, using the physical mic mute button on the headset causes my microphone input volume to be forced to 0 and it stays at 0 even after unmuting.

• In Synapse 4, on the “Mic” tab, the mic toggle switches ON/OFF correctly, but the mic input level slider stays locked at 0 after I mute once.

• In Windows sound settings, the input device is set correctly and the volume is normally at around 80. After the issue occurs, the Windows input volume also drops to 0 and stays there, as shown in the screenshots.

• Because of this, even when I unmute the mic and the toggle is ON, there is no input – the gain is effectively stuck at 0.

Detailed reproduction steps

1. Start Windows and make sure:

   • Default input device is “Microphone (Razer BlackShark V2 HS 2.4)”

   • Input volume in Windows is around 80

2. Launch Razer Synapse 4.

3. Go to the BlackShark V2 HyperSpeed → Mic tab.

4. Confirm that:

   • The Mic toggle is ON

   • The mic input slider is set to a normal value (e.g. 70–80)

5. Press the physical mic mute button on the headset to mute.

   • In Synapse, the mic toggle switches to OFF as expected.

6. Press the physical mic mute button again to unmute.

Observed behavior

• After step 6, the mic toggle in Synapse changes back to ON, but:

  • The mic input slider stays at 0 in Synapse.

  • In Windows sound settings, the input volume for the same device also drops to 0 and stays there.

• Moving the slider up manually works temporarily, but after using the physical mute button again, the volume is reset to 0 once more.

• This behavior is reproducible every time as long as Synapse 4 is running.

Important observations

• If I completely exit/close Synapse 4, the physical mute button on the headset works normally:

  • Windows input volume stays at the previous value (e.g. 80).

  • Mute/unmute only toggles the mic state and does not change the volume to 0.

• So the headset hardware and Windows sound settings appear to be working correctly.
  The issue only occurs when Synapse 4 is active and seems to be caused by the interaction between Synapse 4 and the physical mute button.

What I have already tried

• Checked Windows sound settings:

  • Set BlackShark V2 HS 2.4 as the default input device.

  • Confirmed microphone access is allowed in Privacy settings.

• Disabled mic enhancements / voice gate / audio enhancements in Synapse and Windows.

• Plugged the dongle into different USB ports (front and rear).

• Verified that the headset works properly with Synapse completely closed.

• (If applicable) Performed a clean reinstall of Synapse 4 and updated the headset firmware.

Despite these steps, the issue persists as long as Synapse 4 is running.

Request

Could you please:

1. Confirm whether this is a known issue/bug with BlackShark V2 HyperSpeed and Synapse 4 (mic volume forced to 0 after mute/unmute), and

2. Advise on a permanent fix or provide a workaround that still allows me to use Synapse features without breaking the mic volume, and

3. Let me know if you need logs, config files, or additional information (Synapse build, firmware version, etc.) – I can provide them.

Thank you.