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How do you?
hopefully, you made a nandroid backup and restored it. if not, i would recommend that you get into the practice of making a nandroid backup before you try and mods or themes. if you did not then just wipe dalvik cache and cache and re-flash your rom. your settings and apps will still be there as long as you do not wipe data.
it is even simpler than going back to a nandroid. i did the same thing
just boot into recovery...wipe dalvik and cache...flash synergy again.
all assuming they still are optional on synergy...when you flash the rom over you will lose the carousel and widgets but none of your apps etc