How to change in-game voice?

Greetings, Summoners! Sorry in advance for my english, but i wanted to ask you, Is it possible to change in-game voice?I remember last summer during the Bilgewater event or something like this, the voice in-game was changed with Gangplank's voice and this was pretty awesome... Can i change it like it was on this event? (if someone knows what i want to ask)
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