Hello there!
I was searching for a solution for this and did not find any.

Then i saw multiple discussions on Zabbix Forum and other Websites with the same idea/topic so i decided to post here.

It would benefit a lot of Zabbix Users to have a option on Trigger Severities to create custom severities and also the option to add custom sounds on Frontend Messaging.

Here:

Lets say i want to create a new severity called "Update Complete"
Then, on Frontend messaging i would select this "Update Complete" severity and bind to a custom audio i created using my own voice or TTS saying "Update on Server Complete".

Another exampkle: "Backup Failed" . I would use this Severity and bind a audio saying "Backup on Server Failed" - So alongside with visualization we would also have audio response! Even better.

 
I am sorry if i didnt explained this right but i hope you all understood what i meant... I'm still training my English. 

PS: I know that this would be possible using API of some external software/tool but it would be a superb and handy feature to have this in Zabbix.