This is a comments thread for the following album: https://downloads.khinsider.com/game-soundtracks/album/denpa-men-3-the-rise-of-digitoll
ironically, fans in the community were able to desern that this is indeed the case. It's just pitched up by 800% and sped up a bit, its what gives their voices that unique sound. however we still don't know what TTS engine GS used for TDM games.The uncompressed voice files though, they sound nearly the same as a synthesised American English text-to-speech voice from Tomodachi Life.