The method 12 wherein spreading a spectrum of harmonic frequencies in {HEAD ~ pulse width modulator output signals} for {TAIL ~ N} channels comprises: 
The method 12 wherein spreading a spectrum of harmonic frequencies in { HEAD ~ pulse width modulator output signals } for { TAIL ~ N } channels comprises :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH