An essential component of the process is the recording of the audio and then the manipulation of that audio.
How was this done? What is needed? What considerations do you need to make when recording the original audio? 

Tools for audio manipulation

For audio recording
Audacity
Twisted wave

For manipulation
Praat
Melodyne

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Jon Svensson (Humlab, Umeå University) talks you through this.

During a later part of the project, Satish Strömberg (Humlab, Umeå University) manipulated the audio using a combination of tools such as Melodyne and Twisted Wave (linked above)

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The Listen Lab explains in detail how to manipulate the pitch contour and duration of speech sounds using Praat

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More about manipulation audio using Melodyne
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