Explain "Voice Inversion scrambling" to me

Seeking knowledgeable individual to explain "voice inversion scrambling" (theory) to someone with basic technical understanding (basic physics, waves, etc). Specifically, will need to understand the 3 techniques described in this article: [login to view URL] You will need to explain audio basics (recording audio, digitizing, etc), filters and signal processing, as required. Please be knowledgeable in all this material. Time required: 1-2 hours in total, including some follow up questions which can be done by email. I prefer to do this via real time audio communication (eg. phone) but text/email can also be an option in some situations. Must be a PATIENT, CLEAR and very detailed.