def octave_to_frequency(octave: float) -> float:
    """Converts an octave to its corresponding frequency value (in Hz).

    By convention, the 0th octave is 125Hz.

    Parameters
    ----------
    octave : float
    The octave to put on a frequency scale.

    Returns
    -------
    float
    The frequency value corresponding to the octave.
    """
    return 125 * 2 ** octave