No Sound alert in Safari - Tried everything with no results

Hi

I'm a long time user of x-notifire.

latly i've installed it on my new mac yosemite in safari.

No sound is played when new mail arrives. 

I've tried local, public, wav, mp3, re-convert wav etz

Nothing seems to work.

I have 5 accounts and it is very importent to me to get sound notifications.

Many thanks in advance

m.