Is the CME the only squawk that is currently free? The demo is some chick that sounds like rosie the robot from the jetsons. Maybe the live version is better.
here is what the samle sounds like
http://www.cme.com/products/index/products_index_marketsound.cfm
here is what the samle sounds like
http://www.cme.com/products/index/products_index_marketsound.cfm