Restarting a Primitive:
- Typically the macro writer does not need to be aware of situations that require a restart. The primitive takes care of it inside one its setFoo(..) methods.
- Since a restart is similar to a normal start with different input parameters, the restart is implemented this way.
  - Prior to a restart a primitive overwrites its original input arguments and then sets the state to RESTART.
  - The arguments are overridden using the setArg(name, value) method.
  - Example:
```
  public void setFrameSize(int fs) {
    setArg("FS", Integer.toString(fs));
    setState(RESTART);
  }
```
  - The open() treats the setArg("FOO","newVal") as if the user had put "FOO=newVal" on the command line.