You mean of course that you want this made for you?
Um......Cough'Heil Hitler'Cough
Maybe it can be done easy..
From what you said it sounds as if you want to use non voice files...like just random gibberish sounds for SFX when the Character talks based on what Text is in their text box yah?
It sounds like you already have it all planned out...Why not built it yourself and Upload it free for the rest of us? Then we would think you are a HERO!!!!!
I mean I'd be happy to help out if I wasnt so busy myself..
But can offer some help if you send more info..or at least a Structure outline of the software app you wish to create....
It can be done...If you can shoot some primitive assets(like SFX and more description) to me we could get on to it.as long as you are prepared to share the final capx with everyone id be in on it....was needing one for my game anyway...
More information please...
For starters to make it we would need to fabricate some sort of Text parser....Get a Loop to check over the input text and play sounds based on each letter found but it has to be timed with proper Inflection etc...
I mean I know they exist ..used many professional ones..(DragonSpeech is one of the best I know ) but to get it sounding anywhere near realistic you need years of work...Gibberish version not so hard....