depending on the complexity of the processing your friend might enjoy
buzz. It will handle VST, not to mention all the Buzz only effects,
you can just use one of the HD play generators if the audio file to be
processed is long, just program one instance of it in the sequencer
and process away. Buzz is actually really fast to get the hang of,
just spend 10-20 min with the basic get started quick online manual.
www.buzzmachines.com
hope this helps.
-scott
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