In the rose app, under setting> In/Out setting "Output" check to make sure the XLR/RCA (analog out) are selected? if they are selected, they will be gold, or at least that is the color on my Galaxy Tab.
Also, on the remote control screen, make sure that mute is not on (remote control icon is in the upper right hand corner on the Android app, I assume it is likewise on the IoS app)
Barring either of those, go to the HiFi Rose community and ask for help. The company reps are very responsive genuinely helpful.