This is so stupid. Your CAPTCHA is unusable by blind people, and your audio CAPTCHA is inaccessible (you have to see the <canvas> element to know where to click to access to the audio CAPTCHA).
Actually, we should be worked be ADA compliant and have worked to make this accessible.
Screen readers should pick up the alternate text.
<a href="javascript:AYAH_fallback()" style="position:absolute;left:-10000px;top:auto;width:1px;height:1px;overflow:hidden;">Please complete this audio captcha before submitting the form</a>
Also, I know the audio sucks, but it's the most secure out there, otherwise it would just be a giant hole for bots to get through. It's one of the things we want to make better.
In fact, we've experimented with audio games and had some good results.
If you want to download or listen the audio CAPTCHA, you have to click on a <canvas/> element, which is totally unusable by a blind people. It's like saying “Look, we've made an elevator, but you have to climb some stairs to take it”.
Do you consider that blind people are bots?