I installed this on my live site to protect my user registration from unwanted solicitation. At least I can use this to my login and contact module. Not sure if this extension is still under development or not. If yes, hopefully in the next version (not sure when) the sound feature could be implemented plus the flexibility to be able to be put in any form-related modules. If not, then I gotta put my own PHP captcha program on other Joomla forms. Thanks for sharing this. Keep up the good work.