So there is some unused sounds in hear, like speech allowed, speech denied, speech requested in conferences, and new event. what are those for exxatly.

I mean, exactly what they say I guess? You can have speech operation in conferences such as in a classroom in TeamTalk.

isn't new event like a notification type sound?

Yes? Obviously there don't happen events anymore.

and then you don't see item with atatchment on a listbox being used, that and future item...

Bro of course they're being used. And future items are a blog thing.