How to use the gpiozero.tones.Tone function in gpiozero

def note(self):
        """
        Return the (nearest) note to the tone's frequency. This will be a
        string in the form accepted by :meth:`from_note`. If the frequency is
        outside the range represented by this format ("A0" is approximately
        27.5Hz, and "G9" is approximately 12.5Khz) a :exc:`ValueError`
        exception will be raised.
        """
        offset = self.midi - 60  # self.midi - A4_midi + Tone.tones.index('A')
        index = offset % 12      # offset % len(Tone.tones)
        octave = 4 + offset // 12
        if 0 <= octave <= 9:
            return (
                Tone.tones[index] +
                ('#' if Tone.tones[index] == Tone.tones[index - 1] else '') +
                str(octave)
            )
        raise ValueError('%f is outside the notation range' % self.frequency)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_init(A4):
    with warnings.catch_warnings(record=True) as w:
        warnings.resetwarnings()
        assert Tone(440) == A4
        assert Tone("A4") == A4
        assert len(w) == 0
        assert Tone(69) == A4
        assert len(w) == 1
        assert isinstance(w[0].message, AmbiguousTone)
    assert Tone(frequency=440) == A4
    assert Tone(note="A4") == A4
    assert Tone(midi=69) == A4
    with pytest.raises(TypeError):
        Tone()
    with pytest.raises(TypeError):
        Tone(foo=1)
    with pytest.raises(TypeError):
        Tone(frequency=440, midi=69)

def test_tone_from_note(A4):
    assert Tone.from_note(b"A4") == A4
    assert Tone.from_note("A4") == A4
    with pytest.raises(ValueError):
        Tone.from_note("a4")
    with pytest.raises(ValueError):
        Tone.from_note("foo")
    with pytest.raises(ValueError):
        Tone.from_note(0)

    def __init__(self, pin=None, initial_value=None, mid_tone=Tone("A4"),
                 octaves=1, pin_factory=None):
        self._mid_tone = None
        super(TonalBuzzer, self).__init__(
            pwm_device=PWMOutputDevice(
                pin=pin, pin_factory=pin_factory
            ), pin_factory=pin_factory)
        try:
            self._mid_tone = Tone(mid_tone)
            if not (0 < octaves <= 9):
                raise ValueError('octaves must be between 1 and 9')
            self._octaves = octaves
            try:
                self.min_tone.note
            except ValueError:
                raise ValueError(
                    '%r is too low for %d octaves' %