[Rwp] Determining Input (Recording) Peaks

[Matej Golian]

Hi,
sorry for yet another basic question, but I just can't figure it out
on my own. I'll get straight to the point.
Let's say that I want to record a musical keyboard. I create a new
track, select the 2 inputs of my audio interface into which my
keyboard is plugged in as the recording source for that track. So far
so good, but how do I know whether the input volume isn't too loud or
too low? Is this what the peak inspector is for or is the peak
inspector only usable in case of imported/already recorded audio?
If it is the peak inspector, is the process of detecting input volume
as simple as turning on the peak inspector, selecting the appropriate
options in the dialogue that appears and than pressing alt + F9
through F12 while playing the keyboard? I ask because in addition to
the ones I already mentioned quite a few shortcuts related to peak
detection seem to exist (j, k shift + j, shift + k).
Many thanks.