I was playing around with playing beats I created with an app on the iPhone through Traktor using the audio through option on deck A with an 1/8 jack to RCA cable. I set input routing in Traktor to channel A left and right and I hooked up through channel A on the audio 4. The sound was real muddy and not any good and when I changed it to line in the Audio 4 settings panel and the sound was way to quiet. I tried restarting Traktor and the Audio 4 went back to line and phone lights on in the input mode on top of the Audio 4.

What am I missing?