The "LOCED/UNLOCKED" setting simply lets you prevent anyone from making changes to the System Settings screen - it's purely a setting to say "I've got it fixed, now I don't want anyone to break it."

You can store up to five different curves (preset 6 is "bypass" and simply skips all EQ) by changing the "Preset:" value above from SETUP (which adjusts all five EQ'd presets simultaneously) to PRESET 1 through PRESET 5. If you run the Auto-EQ individually on each preset, you should get much the same thing each time - after all, the SMS-1 is using the same logic each time. You could move the microphone around and run separate Auto-EQ's to see what effect that has, but I did my SMS-1 setup manually. You could experiment with an assortment of different manual curves in this manner if you wanted to.