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