Hidden in Majora's Mask's code is support for the VRS (Nintendo 64's Voice Recognition System).
On boot, the game looks for connected VRSes in any of the controller ports and there are five actions that can be triggered by using voice.
The support for the VRS is left intact in all versions of the game - but they all expect the Japanese version of the unit (NUS-020 JPN), and they all expect Japanese words to trigger the given actions.
Unfortunately, the functionality ultimately ends up being disabled, because the game is looking for 0x801D8E3C (in US 1.0) to be 3 before the voice commands are activated, and it never is set to that value:
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It was likely meant to be set in a function which has been blanked in the final release:
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I have noticed this while scrolling through the recently completed Majora's Mask decomp, but it has originally been discovered and documented by @Zoinkity .
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