I second SND which seems to be the editor but it comes with a learncurve.
Other candidates for extreme sound processing are Csound and Pure Data,
they even let you create your own processing patches.
Cheers,
Malte
--
----
media art + development
http://www.block4.com
new on iTunes: Notstandskomitee Automatenmusik
http://itunes.apple.com/us/album/automatenmusik/id383400418
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