I recently bought Half Life 2 in Spain due to its cheap price tag. After playing the game for a while, I felt the characters' voice a bit squeaky when they talk in Spanish.
Note: My Spanish is not that fluent but I understand the dialogue.
Anyway, after playing the game for a while, I tried to change the language settings in the Option Menu. None. How do you change the language?
How do you change the Language Settings in Half Life 2?
Your copy may not contain the English voices.
Have you registered your copy with Steam?
If you do, you can re-download it, potentially with the English audio files.
