Spark Go

I'd like to figure out how to save tones either locally or online in such a way that I can find them later to reload.
So far I've found the process very confusing and haven't succeeded.
I'd really like to be able to quickly load up the 4 hardware buttons with 4 compatible tones to use for songs etc. I've seen clues that suggest it's possible but have not found instructions for doing it or a dedicated discussion group for asking. Ideas?