a plurality of level control units receiving said modified signals and providing {TAIL ~ normalized modified signals} having {HEAD ~ a constant amplitude} 
a plurality of level control units receiving said modified signals and providing { TAIL ~ normalized modified signals } having { HEAD ~ a constant amplitude }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD