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