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