Asterix or ">"? This sign next to the 2nd voice means that the 2nd Voice EDIT button has been pressed. The keyboard is now in 2nd voice EDIT mode so all voice groups you select will partain to this 2nd voice. Using the -VALUE+ keys, you can go through all the voices within the selected group to choose which of these 2nd voices you would like to associate with the current selected main right voice (IN CAPITAL LETTERS above the 2nd voice).
You can do this modification for all voices on the keyboard (assign which 2nd right-voice you would like to always associate with a main voice when the 2nd Voice button is pressed) and store this configuration by pressing SAVE/ENTER and 2nd Voice.
Hope this helps.