I wanted to view the peak signal levels of my transmit signals.
I'm using ESDR3 V1.0.4 Beta on my SunSDR2Dx G5, and by adjusting the dbm scale, left side of monitor, I was able to bring the peak signal levels into view.
See both SSB and Two-Tone responses.
I have my mike levels set on the Equalizer to be parallel to the purple line, resulting in the flat audio response shown.

Tom W3FRG