I am attempting to run my shure sm58 microphone through all of my car stereo speakers, and play it overtop of/along with an ipod, mp3, or a cd, so I can practice singing on long drives. I am able to get the microphone to run through the speakers, but i cant seem to get an ipod or mp3 player to run along with it, it is just my voice and the volume is pretty low.. What all adaptors would i need to get a ipod to run with it and make it sound decent and balanced with all of my speakers. as specific as you can get would be GREATLY appreciated! Thank you all so much!