In my current system I use an old iPod as the head unit. It runs into a jl audio unit that gives me a physical volume knob. Now I want to use my 4S instead, but if I do I lose a physical button to press to skip tracks. Here is what I am looking for:
Some sort of external music controls to mount in the center console. I will be able to see the phone where it will be mounted, but not reach it. It has to pull the audio signal out of the docking port, not the headphone. It also needs to charge the phone through the dock. An alternative I can live with is audio and controls via Bluetooth and charging via the cable. Ideally it would be small and black, RCA outs if possible.