The audio player may need an update in general, according to many requests from users.
For me, the biggest problem is that the player is very complex and messy and doesn't work well on mobile devices.
1) If I accidentally press the speed button, I have to manually press the button 20(!) times to return to 1x speed. This applies to both mobile and desktop devices. I do guided meditations, so my users have no use for this button, and I'd love to see it be optional.
2) I've never seen the ear button before on other audio services. It confuses people. I would also love to see this be optional.
3) The audio volume doesn't work well on mobile devices. It can only be muted or on. It should be optional as well, as most will just use the manual up and down volume button on their device (which actually works).
In general: Just make the many buttons optional for a much cleaner - and more simple :) - layout for our users.