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int Mix_GroupChannels(int from, int to, int tag)
Add channels starting at from up through to to group tag, or reset it's group to the default group tag (-1).
Returns: The number of tagged channels on success. If that number is less than to-from+1 then some channels were no tagged because they didn't exist.
4.4.2 Mix_GroupChannel, 4.3.1 Mix_AllocateChannels