I’ve read this complaint from many 7610 users. I don’t notice this problem with my 7300’s…they display decent peaks on stronger signals. All the REF control does is raise or lower the entire received display, including the noise floor “grass”…just looks distorted. I like to see the grass at just above the bottom of the graph. The actual signal peaks still remain stunted. So far, I haven’t read about any resolution to this problem, nor any proposed fix by Icom.