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