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Tells you if music is fading in, out, or not at all. Does not tell you if the channel is playing anything, or paused, so you'd need to test that separately.
Returns: the fading status. Never returns an error.
5.4 Mix_Fading, 4.5.18 Mix_PausedMusic, 4.5.17 Mix_PlayingMusic, 4.5.5 Mix_FadeInMusicPos, 4.5.14 Mix_FadeOutMusic