I have a Niles gxr2 whole house system installed with wall mount display and keypads. 
 

i bought the apple 30 pin to composite cable. I connected the 30 pin to niles and the red white part to so os connect generation 1 audio out.. when i play a song i don’t gear any music coming out of the speakers 

the niles wall plate say “source connected” when I switch to ipod but the mute button always stays red for some reason. 

what am I doing wrong. Could someone please help?