The diodes which produce the coring effect are biased by {HEAD ~ a signal} which is related to {TAIL ~ the gain control signal} coupled to the device 
The diodes which produce the coring effect are biased by { HEAD ~ a signal } which is related to { TAIL ~ the gain control signal } coupled to the device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH