{HEAD ~ The method} 2 further comprising updating {TAIL ~ trackers} before determining a respective said fundamental frequency of the respective time frame, wherein said updating of the trackers includes at least one of: 
comprising updating
{ HEAD ~ The method } 2 further comprising updating { TAIL ~ trackers } before determining a respective said fundamental frequency of the respective time frame , wherein said updating of the trackers includes at least one of :
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH