USB Player and Spotify

[dwrae]

USB Audio Player PRO cannot function as generic driver, so any sound you got from Spotify is unrelated to UAPP. However, if you use UAPP, only one driver can be active at a time, so you need to exit UAPP by using the back button from its main screen. Now that usually is still not sufficient to reattach the kernel driver and you would need to disconnect and reconnect your DAC. Make sure that UAPP does not auto-start when connecting the DAC by clearing the defaults in Android settings, apps, UAPP.