Lite soy sauce

Hi there, Natty honey!  What are you up to?  Did you go to the UN summit?  Neither did I.  I had to sing.  It looks like next month is going to be tight on the food budget again, so no pizza.  **Sigh**  I did try to make my own lite soy sauce today.  Well, I didn't really "make" it.  Soy sauce is basically fermented soybeans, wheat and water.  Plus salt.  I figured if I just buy the thick stuff, then I can make my own lite soy sauce by adding salt and water.  The thick soy sauce is sweet, so I'm guessing that it has no salt.  So I gradually added water to a tablespoon of sauce, until I got the right consistency.  Then I guessed the amount of salt I had to add.  It was very close, except the original stuff had a certain sourness to it.  Is that what fermentation is?  Fermentation adds sourness?  Hm.  I think I'll try to add some vinegar to it next...