The low frequency amplifier 304 is typically a switch voltage supply, in which one of {HEAD ~ a plurality} of {TAIL ~ fixed voltage supplies} is selected in dependence upon a current input signal 
of
The low frequency amplifier 304 is typically a switch voltage supply , in which one of { HEAD ~ a plurality } of { TAIL ~ fixed voltage supplies } is selected in dependence upon a current input signal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH