You did an amazing job here! I remember you found the free version of these AI voices for the event. How much would it cost if the whole game was covered by AI voices?
It gives the impression you are watching a movie!
If ran in real time Sophia / Dylan part I is 2:15 and part II 2:30.
Part I is offered for free (no voices) and split in 2 videos.
Part I
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Part II
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The tool that I used for that video is from microsoft
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Back in the day, you could get a free trial without registration. It seems that now you still can get the free trial but you need to sign up, so, I haven't used it again. The free trial consisted in using a maximum of a certain number of characters per outcome. So, I didn't convert the text all at once. What I did is making numerously free outcomes, again and again, to be able to do all the scene. I don't know if you still can get unlimited free outcomes after registration.
The AI's have grown enourmously, so, nowadays there are several alternatives. I think you can find a way to do it for free. For example, I just found this site
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that allows you to convert 1000 characters for free per outcome. It's probable that there are many others. That site is very similar to the microsoft tool I used, the differece is that the microsoft tool allowed me to change the tone of the chosen voice for a more youthful one or for a more matured one. For example, Sophia's and Ellie's voices were the same, but Ellie's voice has a younger tone.
I think that in ChatGPT you can do it for free too, but I haven't tried it.
Regarding the videos you shared, it's impressive how popular this game is. There are several videos with thousands of views and even millions in the porn sites. And there are even people making profit from these games illegally, like the guy you shared that charge you to see the full videos. There are more people than people think who only watch the videos and don't play the games, I remember a case here of someone who found the game through those videos, never played it, he preferred to watch it and even thought that the fan scenes were part of the real story. These devs are losing the profit from that market, the most of the people who upload those videos don't even share the patreon of the creators.