Removed the unused check_inf_and_nan function.

            # write into file

            write(file, scaled_audio, audio_obj.fs)

def check_for_nan_and_inf(input_string: str):

    """

    Checks the input string for nan and inf

    Parameters

    ----------

    input_string: str

        Input string

    """

    if "nan" in input_string.lower():

        raise ValueError("Too quiet.")

    elif "inf" in input_string.lower():

        raise ValueError("All zeros.")

    else:

        return float(input_string)