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The kana is the official pronunciation - it's the way the creators of the disco pronounce it. Perhaps the non-japanese speakers see the disco's name and pronounce it differently, and since the phrase is in english in the CM, they're using that pronunciation there (although the "re" character is said with very little emphasis, i suppose they could be saying "re" at the end there and it might be nearly inaudible... perhaps, could be, i dunno. lol) ...but since the creators of the disco are japanese, I'm treating the katakana that's displayed everywhere as the official pronunciation.
And yeah, the ch is usually pronounced like sh in french, but because of the origin of this particular word, it's pronounced as a "k" in this case. Kinda like how in english, "ch" is usually pronounced like "ch" as in "chat" or "check," but in "orchestra" it's pronounced like a "k" as well.
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