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