So I'm sitting here indulging my Disney Geekdom a little and reading Disney patents and I came across the following one titled Speech Transformation System filed back in 1993.
To put it in a nutshell, it is a system that takes a target voice speaking a phrase as an input. Then it takes a source voice speaking the exact same words and calculates the spectral differences between them. The system is then put in real time mode and whatever the source voice speaks comes out sounding exactly like the target voice. In other words, a person playing Alice would speak whatever they wanted to and the system would "morph" their voice into the voice of Alice.
Now, I see the characters wearing the little mics in the parades and such and I was wondering if anyone knew if this system was being actively employed? By the patent drawings it was originally intended to be used by fully costumed (head) characters such as Mickey but they don't speak at all except during the parades/shows and that could easily be done by pre-recorded audio track as you can't see the mouths moving.
This is a really slick piece of technical work and it would be so cool if they were using it.