[Elecraft] P3 Ref LVL and SCALE? Means What?

[KM4VX]

I am trying to understand what these terms mean, and having read the related
posts still can't figure out what they mean or what settings to use. I want
the P3 to reflect cw signals and sometimes ssb signals within a given span
(say plus and minus 75). I have no idea what the db signals to he left
reflect because they can't reflect receiving signals at that db level can
they? (-100? -50? ??) I think ELECRAFT should include a description in the
owner's manual of what the terms mean and make some suggestions of what
settings to use. The art of scientific prose is to be able to articulate the
complex so the masses may understand. Also, a default setting  is always
appreciated. Many thanks. Ron
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