Starting in v1.5+ Popper, you can have an easy method to play a constant background track while browsing.

First step is to go to Popper Setup/Global Config/Displays tab. You want to change Audio/music drop down to “active and Update” like below.

Then in Media manager, you go to playlists. And on Home Playlist you simply drop your MP3 file into the AUDIO pupbox. This will be the default. You can also change it by playlist by setting the AUDIO on individual playlists as well.

Thats It.