I know lots of players have this feature so if you download the lesson file you can open it in a player that lets you slow it down. For example, in Windows Media player when I right click the play button I see choices of slow, normal, and fast. [ Ctrl+s, Ctrl+n, Ctrl+g ]. I read somewhere that Windows Media player is gone from Windows 10 though. If using iOS check out an app called AudioTracker. You can play DJ and rewind the “record” (e.g. your CPod audio file) as many times as you like. I don’t think you can slow down though.
Foreign languages often sound “too fast” for all of us, even those with normal hearing, so you may want to experiment with a mix of slow and fast listening experiences. Also, if you are a premium subscriber you can play the lines of the dialog one at a time from the dialog tab. These are separate recordings, not excerpts from the podcast, and so will be free of sound effects.