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