Notes from TC 3-21.5
"Any of the positions of rest may be commanded and executed from the Position of Attention." It's not some sort of sequence, some hierarchy that has to be followed. You can from the position of attention, put a formation into rest or at ease
"Stand At Ease. The command for this movement is Stand at, EASE. On the command of execution EASE, execute Parade Rest, but turn the head and eyes directly toward the person in charge of the formation. At Ease or Rest may be executed from this position." I beat this up over in rifle drill as well, but basically stand at ease is not the same as at ease, yet I see it misused over and over.
120 BPM - Metronome (Quick Time pace)
180 BPM - Metronome (Double Time pace)