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