The other suggestions should good, but alternatively
you write a patch in Pure Data to do this, using the
built-in object fiddle~, which estimates pitch (fairly
accurate with tweaking) and a LADSPA pitch shifter
(the best I've found is pitchScaleHQ from the
collection at
www.plugin.org.uk). PD takes a while to
learn how to use, but once you have it's great for
doing stuff like this quickly.
Stefan Turner
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