adjustments in preprocessing steps

            self.in_fmt, in_file, fs=self.in_fs, in_meta=in_meta

        )

        if isinstance(audio_object, audio.MetadataAssistedSpatialAudio) or isinstance(audio_object, audio.OMASAAudio):

            if self.preamble > 0 or self.background_noise or self.repeat_signal:

                raise ValueError("No preprocessing 2 possible for formats including MASA metadata")

        # modify ISM metadata

        if self.in_fmt.startswith("ISM"):

            if not self.preamble:

    logger.info(f"Concatenating input files in directory {cfg.input_path}")

    # derive input format to preprocessing 2 (either input or preprocessing format)

    try:

        input_format = cfg.preprocessing.get("fmt", cfg.input["fmt"])

    except AttributeError:

        input_format = cfg.input["fmt"]

    # concatenation of met files not possible -> do not concatenate MASA and OMASA

    if "MASA" in input_format:

        raise ValueError("Concatenation of formats including MASA metadata not possible")

    # concatenate ISM metadata

    if cfg.input["fmt"].startswith("ISM"):

    if input_format.startswith("ISM"):

        cfg.concat_meta = []

        for obj_idx in range(len(cfg.metadata_path[0])):

            cfg.concat_meta.append(

            cfg.items_list,

            cfg.metadata_path,

            cfg.concat_meta,

            cfg.input["fmt"],

            input_format,

        )

        # set input to the concatenated file we have just written to the output dir