What if rather than the game calling on an entire phrased audio file it called for a sequence of letters?
The only audio files recorded are letters, the different sounds, and different tones, and few combination of letters that have their own sound as if an individual letter (like an).

Like the file 1A could be for the letter "a" and pronounced ay; 1B could be for the letter "a" but pronounced ah. "an" could be 114. Letter "d" = 4A pronounced de. Letter "d" = 4B pronounced da.
So when the game wants to call for the audio file "and" it calls for the audio fragment files (individual letters) as a code sequence.
and = 114.4B

in the CK you could choose the voice type, a tone dragger, the timing it drags out the word or letter down to fractions of a second, and I'm sure much more; I am no expert on sound.

Now I would be unable to accomplish writing or implementing this concept or even if it is possible, but I feel it would cut down on file size, time, money, and increase mod enjoyment.