PocketCasts has a feature called _Volume Boost_ which boosts the sound level. This is often helpful in some podcasts where the audio level is a bit too low in some sections.
To my knowledge, Antennapod does not have this. I've been using it for over a year now.
AntennaPod has a volume reduction setting that is per podcast which solves the same problem, but from the opposite side if the spectrum. All of the podcasts that I subscribe to that have poor volume levels are all too loud. I'm sure there are lots of others that are too low though.
This is amusing to me, as my perpetual problem with phone audio is that everything is too loud. I am repeatedly tapping between the lowest tick and full mute, because I am already at the bottom of the standard curve.
To my knowledge, Antennapod does not have this. I've been using it for over a year now.