Keep play books audio in the background? Listening to books in Google Play Books read aloud and would like to know what needs to be done to keep the audio playing in the background so I load up other apps at the same time.

Rooted nexus 5 running 4.4.4
According to this google fourm's message, 17 Dec 16, this is a feature since version 3.11.19

Quote danjaf
Confirm this has been resolved in version 3.11.19
I am running Marshmallow 6.0.1
Thank you to the developer who heard our first world problems.

I have tested myself in at the current version of 4.4.9_RC07.213889590, released 21 September 2018, and can confirm it is still present.