I revised my set up over the weekend and finished installing my LI on the S4.
I was able to integrate an OEM momentive switch (sunshade) in the dash and have it enable a latchable relay for power to the LI and the STi-R (I have another oem momentive switch that mutes the STi). I was also able to have the sound from the LI route through the phone hookup on the Symphony II for lidar alerts only.
I tried to find a radio Mute wire for the STi-R to connect to the symphony II, but I could not find one on it or in the Manual. I know the 9500ci has a radio mute, but has anyone been able to mute the radio with the STi-R?
Any workaround suggestions would be appreciated as I know enough about car electronics to be slightly dangerous