*Created by: 183amir* The databases provide a load method in its `File` class but this is not used in the preprocessor when data is read. `read_original_data`: https://github.com/bioidiap/bob.bio.base/blob/master/bob/bio/base/preprocessor/Preprocessor.py#L87 Some databases may contain more than one sample in one file (like videos and audios with two channles); while I understand that this is handled in `bob.bio.video` for video files, it is not clear how this can be handled for audio files with two channels in them. If the preprocessor was calling the `load` method of the `File` (`BioFile`) class, we could use logical paths for `File.path` instead of the actual path and handle this in the `load` method. For example, `File.path` would be `origpath_A` or `origpath_B` depending on the channel and then the `load` method would return only channel A or B depending on the logical path that was requested.