It's an unfortunate use of Terminology.The control(ALC) actually adjusts Audio DriveYou see the same effect if you go into Audio Control and turn it Up/DownThe ALC "Meter" just shows you the Result of Turning Up/Down DriveEver since PSK31 came out in 1998I set Radio to 100W, and adjust Audio Drive to 10~50WThe PA is biased for optimum, and you get a very clean signalOn most Radios, ALC just starts to show from @ 50~60W, I like Zero ALC
Why not use the slider already there?