I am considering getting one of the PAC AAI-GM9 adapters to connect a portable MP3 player like Karma to my factory stereo. In the instructions it states "factory headunit must have a working slave unit which uses the GM 9 pin connector", does this mean my intended use will not work unless I have something like a stock CD changer plugged into the 9 pin connector? If so, is there a way to spoof this? Or better yet, is there an alternative to the AAI-GM9 that works for 1 RCA input from a portable player?