Lovely, thanks for the example. I really like how the underline is subtle yet effective. The animation/effect where it seems to inch forward is also intriguing; how does that work? (Also, this is subjective but have you considered making double-clicking on the text open the audio player even when it's not been started yet? Would make it more discoverable, though I imagine some could get annoyed. Another minor thing: when the audio is paused and you double click somewhere, the audio position changes but this is not reflected in the player; only takes effect when you unpause.)

You're doing cool work, good luck with your service! It looks very useful and if someone I know is running a podcast I'll recommend it for sure; it looks really well-done and polished (at least the example you shared).