Without hacking, I don't think you can. Halo Custom Edition is only PC
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no I'm afraid not, microphones don't have any use in Halo Custom Edition :(
No!
check here for basics and its custom edition http://www.econsultant.com/cheats/h/halo-custom-edition.html
It is the product key of a Halo PC disk.
Refering to halo 3 and halo reach their is a custom forge game mode, here you can build and shape your very own map creations for both custom and recreational use.