def KeyFilter(notes): return _Filter(_mididings.KeyFilter(0, 0, notes))
def KeyFilter(lower): return _Filter(_mididings.KeyFilter(lower, 0, []))
def KeyFilter(upper): return _Filter(_mididings.KeyFilter(0, upper, []))
def KeyFilter(note_range): return _Filter(_mididings.KeyFilter(note_range[0], note_range[1], []))