Groove is the only audio app I have that's actually working properly in the background on this build. The Podcasts and TuneIn apps are hit and miss over both Bluetooth and wired outputs. It seems completely random too...sometimes Bluetooth will work, sometimes it won't. Sometimes wired will work, sometimes it won't. If there's something triggering the bad behavior, I haven't found it. These last 3 builds have been pretty terrible for me, even by Fast Ring standards (and yes, I've done hard resets), so I hope the next build sorts out some of these (not-so-)little issues.