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        if get_mld:

            def parse_wav_diff(proc: subprocess.CompletedProcess) -> float:

                if proc.returncode:

                    raise ChildProcessError(f"{proc.stderr}\n{proc.stdout}")

                line = proc.stdout.splitlines()[-1].strip()

                start = line.find(">") + 1

                stop = line.rfind("<")

                return mld

                # TODO probably needs a fix to show up in pytest

                if proc.returncode:

                    print(f"{proc.stderr}\n{proc.stdout}")

                return mld_max

            mld_max = 0

            toolsdir = Path(__file__).parent.parent.joinpath("tools")