CMS Made Simple Forums

Hi,
I've added the Comments module to my web site but I receive much more spam than comments. Therefore I've also installed the Captcha module but I can't find a way to make it accessible to blind users.
Is it possible to add an audio or a question to the Captcha module instead of an image?
Thanks in advance.
Gigi

Captcha module has support for recaptcha http://recaptcha.net/learnmore.html
Or, try using the Akismet module for silent spam filtering