This game is using Microsoft's Agent and its Merlin character.
This MSAgent normally comes bundled with all MS Windows packages starting from Windows ME.
However, not all its Text-To-Speech capabilities are always installed with Windows.
For that reason I tried to bundle all the packages required for running the MSAgent with its Text-To-Speech capabilities.
(thats why the installation is so big).
If you still cant hear the Merlin character speak - try downloading and installing the following file: