I am creating all of the sprites for the different expressions and I am wondering if there is any guide or explanation (or anyone who knows) how these different eye / eybrow / mouth shapes are combined to create the different expressions.

Right now I am examining the different default characters that come with the program to try and figure out what is used for what - but it is difficult.

Also, the 'expressions' validation tool doesn't seem to use very many of the different sprites... I noticed that you can add your own validation script file.  Does anyone know where a more-accurate script is?

Any help would be greatly appreciated!