If you are experiencing sound issues with your Fnatic headset, please try out the following solutions. 

First, check if the sound volume wheel on the cable is properly set up:

If the issue with the low sound persist, please check the Sound settings in your Windows:

Under the 'Playback' tab, right click on an empty space and enable "Show Disabled Devices" . Then locate 'Sound Control Panel' in top right:

Look for a device that is disabled and re-enable it, as this may be the connector for the REACT headset. Disable any other devices.

If your headset volume is low during the game, while your game is running, please make sure that the volume is properly set up in the volume mixer: