Cartoon Character Voice

I'll attempt to answer both questions: Pretty much all cartoon voices aren't manipulated at all - they are recorded by professional voice actors who modify their own voices to suit the character they are voicing. This sounds altogether more natural because the voicing parts of the sound (as opposed to the sound itself) is still understandable - which isn't the case with electronic changes, as a rule.

I did a quick search, and I cannot find any on-line pitch shifters at all - only ones that work on a file. Audition won't do it, either. I would have thought somewhere though there ought to be an app that does this - but if there is, it won't run in Audition - it would almost certainly be a stand-alone.