public RhythmGroup makeGroup(String title){
  final RhythmGroup group=new RhythmGroup();
  group.mTitle=title;
  group.mIndex=mRhythmGroups.size();
  group.mControl=this;
  mRhythmGroups.add(group);
  if (mCurrentNotificationGroupIndex == NOTIFICATION_NO_GROUPS) {
    mCurrentNotificationGroupIndex=0;
    requestNotificationUpdate();
  }
  return group;
}

public RhythmGroup makeGroup ( String title ) { final RhythmGroup group = new RhythmGroup ( ) ; group . mTitle = title ; group . mIndex = mRhythmGroups . size ( ) ; group . mControl = this ; mRhythmGroups . add ( group ) ; if ( mCurrentNotificationGroupIndex == NOTIFICATION_NO_GROUPS ) { mCurrentNotificationGroupIndex = 0 ; requestNotificationUpdate ( ) ; } return group ; }
make a new rhythm group , registered in this rhythm control
