The Sound is never played
By leaving the dashboard of VikRestaurants open, a notification sound will be emitted every time a new order/reservation comes in.
If you don't hear any sounds, it is possible that your browser is preventing the auto-play of an audio without controls. Since VikRestaurants 1.8 an alert message should be thrown in case the system is not able to play sounds (the alert is shown only once per session).
From the user's perspective, a web page or app that spontaneously starts making noise without warning can be jarring, inconvenient, or off-putting. Because of that, browsers generally only allow auto-play to occur successfully under specific circumstances.
For this reason, you might have to teach your browser that the website in which our extension is installed is safe and the sounds auto-play should be allowed.
Here's a list of guides, grouped by browser, that should help you authorizing your website to auto-play the sounds.
Mozilla Firefox
https://support.mozilla.org/en-US/kb/block-autoplay
Google Chrome
https://developers.google.com/web/updates/2017/09/autoplay-policy-changes
Safari
https://support.apple.com/en-in/guide/safari/ibrw7f78f7fe/mac
Microsoft Edge
https://docs.microsoft.com/en-us/microsoft-edge/dev-guide/browser-features/autoplay-policies