I certainly are not able to answer about what PTP shows, but you could open an output file created from PTP in Audacity and check the levels there to see how they correspond. Also, you can check for clipping, analyze, etc.

BTW: Welcome to the forums.


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.