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I've been looking all over the net, and I've found some voice synthesizers, but they either don't work, aren't free, or just have 5 or so voices to choose from... I need to get a synthesizer with which I'm able to edit the voice myself. This is needed for GLaDOS-like robotic character for my game.

I did some searching here on GDSE, and it seems that questions like this often get closed as "not constructive". I believe that this is not the case, as this could help many other people who happen to be searching for the same thing.

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You know, voice synthesizers are pretty complex things to make. It doesn't suprise me that you can't find any "decent" free ones. –  Jaakko Lipsanen Mar 4 '12 at 12:21
    
Hmm, too bad. :/ –  jco Mar 4 '12 at 12:40
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If Stephen Hawking has to sound like a robot you can be pretty sure that there isn't a better solution available. –  Patrick Hughes Mar 4 '12 at 19:54
    
Actually, that's the desired effect! As I said, I'm creating an evil robot AI. –  jco Mar 4 '12 at 19:55

2 Answers 2

up vote 3 down vote accepted

Since you're looking for a non-realistic voice check this out: http://speech.cs.cmu.edu/flite/ or if Java doesn't frighten you then here: http://freetts.sourceforge.net/docs/index.php

If those don't help then going further back Amiga had a TTS engine built into it that may be available somewhere.

Search terms for further investigation would be "text to speech" or "speech synthesis," anything with "voice" in it tends to go off track.

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I know this isn't a direct answer to your question, but I'd like to drop in that GLaDOS's voice isn't synthesized though - it was recorded by an actual voice actress and post-processed. That's certainly another possibility to consider.

And just because I thought it was interesting, here's a video that shows how it's possible to create something that sounds very much like GLaDOS in the games, by taking an unprocessed sound clip recorded by the aforementioned actress, and processing it in a voice manipulation tool such as Melodyne. Most of the changes were removing pitch modulations between words, changing the pitch here and there, and messing with the formant of the sound.

I think the original sound clip could even have been recorded with no pitch variation between words, with pitch changes then being added in the application. Melodyne is not free though but there is a 30 day trial you can try. And there might be a free alternative out there, although I'm unaware.

Another alternative to editing the voice like this, is to use software that applies the changes as a whole to your sound clip, and automatically makes it sound like a robot. I'm thinking for instance about using some sort of Vocoder VST, which you should be able to find by googling a bit.

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Well, I think that voice acting is out of question. My accent will probably sound weird, because English is not my mother tounge... –  jco Mar 5 '12 at 22:17

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