Alter and Circulate

From parallel waves: All Swing 1/2. Centers Cast Off 3/4 and the very centers Trade, while the ends U-Turn Back and Circulate once, turn the star 1/2 (Counter Rotate each diamond 1/2), and Flip the Diamond. Finishes in waves.

If directed, the star can turn other fractions (e.g. "Alter and Circulate, turn the star 3/4"). Note that the star turning is done by Counter Rotating the diamond, not by Diamond Circulates: No matter how far the star turns, the same people flip in at the finish. Thus, "Alter and Circulate, turn the star 3/4" would end in a tidal wave.