This applies to the VRM Box

1. Connect the VRM Box to the USB port of your computer.
2. Connect the S/PDIF output on your audio interface to the VRM Box's S/PDIF input.
3. In your audio interface’s control panel, ensure that audio is sent to the S/PDIF output of your audio interface.
4. With the volume control turned down, connect your headphones to the VRM Box.
5. Open the VRM software, and check the icon in the bottom right corner of the VRM software that the VRM Box has locked to the S/PDIF signal.
6. Start playing audio from your DAW software or any media player.
7. Turn up the volume control on the VRM Box until you have the required level in your headphones.