I have recently installed a Caddipod in my 05 CTS. Works great but the volume from the iPod is lower than the cd player. I would like to correct this. I have read that others are unhappy with the output from their iPod when interfaced to the factory stereo. Would it work to connect an OEM amplifier adapter between the Axxess box and the factory radio? The left and right input into the stereo share a common ground.