My device physical media keys (pause, ffwd, etc) do not control the players.

On Android versions prior to 8.0, this should work again starting with version 2.3.5 of the app.

On Android versions 8.0 and higher, media keys will only work with the app in the foreground or for apps that actually play audio aloud. Starting with 2.4.0 beta, Orange Squeeze plays silence in order to try to convince the device that the app should be allowed to respond to media keys.