mine..stock Clarion HU unit with no AUX in

so, to make my mp3 player able to work with my car streo is : add a preamp/equalizer/crossover etc. which have AUX in + amp.am i rite?

can someone confirm me this really work?

one more thing is can i still can have control on my mp3 player
instead juz act as thumbdrive only?

Other alternative sifu?(no FM modulator plz..)