Ron,
I have SS ...from Brett...and the message I got is that Speech Level singing means that we shouldn't have to exert ourselves when we sing any more than when we speak. Don't need to push or do anything weird to get notes out. Sometimes we talk louder than other times but to accomplish that we aren't doing anything different with our bodies physically.
BUT...to sing, we need to annunciate more, hold notes longer (than talking) and find the right vowel modifications to make it pleasing for the listener. If we talked like that, it would sound very strange.
Hope that made sense!