How do I set thunderbird to play a notification sound when I receive an email?

In Thunderbird:

Tools|Options|General→When new messages arrive:

kenyon5513 said

How do I set thunderbird to play a notification sound when I receive an email?

thanks for the reply Zenos. I have my settings as follows (screen shot) but still no notification sound. Am I missing something?

As a check, does it work if you set it to use the system default sound?