[Feature request] Play ocarina with microphone

There should be the ability to use a mic to play songs on the ocarina like in the Nintendo Switch 2 remake which lets you use either voice or an instrument, and also doesn't need to be in the proper key

The issue names no files, tests, or entry points. Start by locating the existing ocarina gameplay and audio-input paths, then determine how microphone or voice input should be integrated. Done means songs can be played with a microphone or instrument without requiring the proper key, with behavior matching the requested feature.

Written by the indexing model from the issue text.