Gain {HEAD ~ change} according to {TAIL ~ the present invention} is incremental according to predetermined gain step sizes 
Gain { HEAD ~ change } according to { TAIL ~ the present invention } is incremental according to predetermined gain step sizes
OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH