>>If I want to make my own sound, should I use "USER" bank? I think that "USER" bank is ok to delete but I am still not sure

Actually, you can *only* use the User Bank unless you immediately save your new patch from TEMP to a disk or to your computer rather than writing it to the User Bank.

But when you edit a patch, you're actually editing it in the TEMPORARY buffer, not the User Bank. When you are finished, then you must decide where to save the patch: either to the User Bank or to disk or to your computer.

BTW: Even if you save it to a User Bank location, you can always recover the original user factory patch by initializing the patch to "preset."