try the input toggles
hi,
I had just put one in a couple of weeks ago. initially I had the same problem (noise and low level music) with a roady and a mp3 player. here is what I noticed and fixed.
1) when you have only 1 source plugged in and it sounds bad, press the preset button to switch to the other input signal (preset 1 for input 1 and preset 2 for input 2).
2) when you have 2 sources plugged in, turn off the source thats not been used.
When I first turned on my roady after installing the PAC, the quality sucked and the noise level was high. So I decided to test the mp3 player and I switched the preset/input before turning on the mp3. then the roady signal came through great on the 2nd preset/input.
So after switching cables/input to the roady abit, I realized that the PAC will allow signal to come through from both inputs. however, one will come over clearer than the other depending on the selected input. Its almost as if there is cross talk between the inputs.
you would just have to test and try to see which input cable you installed sounds best for which input selection.
good luck...