I’ve stated repeatedly why putting a record level is an inferior idea to a normalization or +6dB volume boost post function.
Like the fact that when the master knob is at its unity you see exactly what the record level is minus one dB already… right now. The P4 currently does have a record metering capability in a manner.
And related to that above fact that it will be extremely easy to distort the sound of the recording without knowing it if a ± record level function is added.
Here is a video. Might take some time for Google to process it first.