formatting + remove unused variables

    # add preamble

    if preamble:

        concat_meta_all_obj = add_remove_metadata_preamble(concat_meta_all_obj, preamble)

        concat_meta_all_obj = add_remove_metadata_preamble(

            concat_meta_all_obj, preamble

        )

    write_ISM_metadata_in_file(concat_meta_all_obj, out_file)

#

import logging

import sys

from abc import ABC, abstractmethod

from itertools import repeat

from pathlib import Path

from typing import Iterable, Union

from warnings import warn

import numpy as np

from ivas_processing_scripts.audiotools import audio

from ivas_processing_scripts.audiotools.audioarray import window

from ivas_processing_scripts.audiotools.audiofile import concat, trim

from ivas_processing_scripts.constants import LOGGER_DATEFMT, LOGGER_FORMAT

from ivas_processing_scripts.processing.config import TestConfig

from ivas_processing_scripts.processing.tx import get_timescaled_splits

from ivas_processing_scripts.utils import (

    apply_func_parallel,

    list_audio,

    pairwise,

)

from ivas_processing_scripts.utils import apply_func_parallel, list_audio, pairwise

class Processing(ABC):

    logger.info(f"  Generating condition: {preprocessing['name']}")

    # set up values for progress display and chunksize

    count = len(cfg.items_list)

    width = 80

    # run preprocessing

    args = list(

        zip(

    if chain[0].concatenate_input:

        concat_setup(cfg, chain, logger)

    # set up values for progress display and chunksize

    count = len(cfg.items_list)

    width = 80

    # run preprocessing 2

    args = list(

        zip(