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Old 6th April 2013
Registered User
Most DAWs have pitch and time stretch algorithms which are accessed as offline processing. (Offline processing can be far higher quality than realtime plugins, because you often have quality options, and serious pitch stretching at high quality takes serious rendering time - real time is a compromise).

It's not commonly known that you can turn OFF the time stretching and formant shifting options that are typically defaulted to ON. That makes them more like analog tape or vinyl pitch shifting - where the pitch and formants all go down together as the time stretches out.

So you could just stretch the audio to fit the time you want to fill, with pitch an formant correction turned OFF.

Some algorithms give you are graph where you can choose your curve. Play around with whatever pitch and time tools your DAW has.