If your students report problems with the sound on the Holmwood's website, you should check the following things:
Make sure you check all the sound settings of the PC or device, the headphones (if applicable) and the video/audio player on the website.
If you are using Windows, right-click on the speaker icon in the taskbar and open the Volume Mixer. Check if the volume for the Holmwood's browser tab is turned up.
Please check the proxy or firewall settings. Make sure the following domains are whitelisted: