Extending Captcha for Audio

Why not use a totally passive honeypot approach instead?

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"Andy Millne" <webforumsuser@macromedia.com> wrote in message
news:fn5lk5$5bl$1@forums.macromedia.com...
> Has anybody attempted to extend the ADDT captcha functionality to include
> a
> text to speech alternative for the visually impaired? If not, does anybody
> know
> of a text to speach library for PHP similar to the GD library for images?
>