Adding Letswave to the Matlab path

You should not add all the subdirectories of the Letswave toolbox to the Matlab path, as some of the functions located in the /external folder could conflict with other Matlab toolboxes installed in your path (e.g. EEGLAB, Fieldtrip). When launching letswave from the Command window, the required folders are automatically added to the top of your Matlab path, thus ensuring that the correct functions are used.