IRCAMAX SuperVP is a set of 5 plug-ins for Ableton Max4Live. You really have to head to the Ircam website and watch the demo videos. Each of the plug-ins SimpleTransp, Transp, Scrub, Mover and SuperVPSynth allow for some serious audio rearranging, part transposing, formant manipluations, etc… My favorite is Mover. 139 Euro.
“Mover offers a different way to control time position and transposition performed by the SuperVP engine. It displays the sound on a big waveform on witch the user can move using the mouse, its MIDI controllers or a joystick. It can be easily use to improvise on the sound material thanks to its synchronized random motions capabilities.” – ircamax.ircam.fr
For more info: ircamax.ircam.fr