Pro Logic II Gaming Question

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I recently hooked up my Wii to my surround receiver. It does have Pro Logic II (which the Wii outputs). However, I heard there was a "game" mode specifically... my receiver only has "movie", "music", and "off" modes for Pro Logic II. Is there, in fact, a game setting existent somewhere? (Not on my reciever, I'm asking if it's an actual mode). Is my receiver just missing something? How much of a difference will it make?

Thanks in advance.