When the knob is pressed in a direction indicated by an arrow Pf, {HEAD ~ the press switch} 8 makes {TAIL ~ a stroke} 
When the knob is pressed in a direction indicated by an arrow Pf , { HEAD ~ the press switch } 8 makes { TAIL ~ a stroke }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL