Indeed, Yahoo! Messenger for Mac does not support voice, even though it supports webcam video.

For audio, you’ll need to go with iChat or Skype.

I was astounded that Yahoo would bother releasing a Video chat feature without sound/voice. I was helping my father-in-law install the new Yahoo client on a Mac (he’s a recent retiree and convert to Mac) and I kept telling him that “mute” must be checked somewhere, because it doesn’t make any sense to have video without voice. I did a search in Yahoo (found nothing in the Yahoo features or documentation), but only when searching the user comments did I find any mention of Voice or lack there of on a Mac. I can’t wait for the new, new, beta with voice. Those “talkies” movies have been around for a while now in iChat. If we weren’t trying to communicate with people in other countries who don’t have the luxury of Macs and for some reason they also chose Yahoo over AIM - then I just wouldn’t even care. Does anyone know of a Mac chat client that has voice and is compatible with Yahoo. Maybe we should ask Apple to add compatibility between iChat and Yahoo (like they have with AIM) - it might be faster?

- A commenter on J. Zawodny of Yahoo’s blog.

No wonder Yahoo is dying. And Google Talk is about to take a huge step forward, too, so the competition is tough.