The 1.0 version of Spookio for Mac is available as a free download on our website. The application is included in Audio & Video Tools. This free software for Mac OS X is a product of Gut Groove Labs.
From the developer:
Spookio is a sound generator that helps you create all sorts of weird and spooky sounds just by moving your mouse in the two dimensional plane. The application provides three different sound generators. Nice sound effects and a 'musical mode' are included.
You may want to check out more software for Mac, such as iTunesLister, Bouncy or OnTheAirCG, which might be similar to Spookio.