a control voltage source with a phase output and a neutral output for supplying {HEAD ~ control voltage} to said moment defining circuit and {TAIL ~ said level changing circuit} 
to
a control voltage source with a phase output and a neutral output for supplying { HEAD ~ control voltage } to said moment defining circuit and { TAIL ~ said level changing circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL