I used to have more than a dozen e-mail accounts in The Bat for the longest time.
And for a few accounts I set up custom sound notification .wavs so I would know which
account received new e-mail instantly.

Fast forward to a few months ago when I decided to consolidate my e-mails to just
four or five accounts.
In one account I have around 10 folders (that used to be separate accounts).

So now I want to set up a few folders with custom sound notification .wavs
exactly the same way I used to have with the accounts.

Can someone please tell me how to achieve this?
The Bat is supposed to be ultra smart/flexible.