Calibration of the system is provided by means for {TAIL ~ an operator} to specify tone densities for the second medium that correlate to signal levels derived from the first medium for {HEAD ~ each channel} 
Calibration of the system is provided by means for { TAIL ~ an operator } to specify tone densities for the second medium that correlate to signal levels derived from the first medium for { HEAD ~ each channel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD