"Movie" has a sloping fr, diminishing as you go up in freq.
"Flat" has a flat fr from the lowest to the highest fr.
"Off" puts Audyssey out of line.
you should put some movie or music on and decide which you prefer.
you may have other Audyssey adjustments too, like HT, which cuts a little bit of high fr. because Blu-ray/dvd's are equalized for large halls (cinemas); as those hf don't have to travel far in your ht room, the high fr. might be too strong.
personally i like flat fr, so i use:
Audyssey "flat" and "HT" on.
