The control signal generator is configured to generate a control signal in {HEAD ~ response} to {TAIL ~ user engagement} of the record command key 
to
The control signal generator is configured to generate a control signal in { HEAD ~ response } to { TAIL ~ user engagement } of the record command key
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH