The HypnOS BIOS always says "No text-to-speech voices found on this PC, Hypii's voice is deactivated".
Now, I have a stock Ubuntu installation and I *know* that it comes with a text-to-speech command by default called spd-say. (It's as easy to run as invoking the `spd-say text here` command.) I guess that's not supported by the game, but which ones are?