From a Wave or Facing Couples.
- Arm Turn 1/2;
- Centers Cast Off 3/4 as Ends U-Turn Back;
- Counter Rotate the Diamond 1/2;    
- Flip The Diamond.
Ends in a Wave (of opposite handedness).
  Alter The Wave is a 4-part call.
Notes:
- 
The Diamond Counter Rotate 1/2 is often referred to as Star 1/2.
- 
Dancers who Cast Off 3/4 become the Ends of the
    resulting Wave no matter how far the Diamond is turned.  Dancers who
    U-Turn Back always become the Centers.
- 
The Diamond Counter Rotate 1/2 is danced by turning
    the whole Diamond 180 degrees around its center of gravity.  Centers
    retain handholds throughout the Diamond Counter Rotate and the
    Points should NOT place their hands into the 'Star', but
    instead should point as they would when identifying Diamonds.  This is
    very important, because if there are 3 or more hands are in the Center,
    dancers tend to forget who is to flip whom for the Flip The
    Diamond, especially if the caller modifies the amount to 'turn the
    Star'.
- 
From a Wave, Ends remain Ends as Centers remain Centers.
| Alter The Wave, Star 1/4: 
 | 
Spin Back [C4] (Norm Wilcox 1972):
 From Facing Couples or a Wave.
Arm Turn 1/2; Centers Cast Off 3/4 as Ends U-Turn Back.  
Ends in a Diamond.
This is the first 1/2 of Alter The Wave.
 See also Alter & Circulate [C2].