Yahoo mail no audible, just vibrate

[Doc Paul]

I had been using att.net under email icon. It took forever to get the emails to the DROID. I was told to use the Yahoo icon. Now I get the emails right away, I can only get vibrate and no audible response. Anyone else have this problem???
If so, is there a fix??
If not, what am I doing wrong?? (setup suggestions please)
Thanks in advance
Doc