Hi there - Further to what Bill said about loading into Sound Memory.
I don't know whether you realise it but Sound memories are "temporary" insofar as if you load another "file" that contains a different Sound Memory setting then it will overwrite the last one.
So two things. If you wish to keep a specific Sound memory then either make sure that when you load "new files" you select page 2 of the Load feature and turn OFF the Sound memory element OR make sure that you keep a "master" of your favourite sounds so that you can "reload" again when required.
If I am telling you something that you already know then I apologise, but I bet there is not one of us that at sometime has spent time putting in settings and then knocked them out because we haven't been aware why!!! Joan