The aux will compensate for the lack of volume in your mp3 file and player, in your case your ipod, in my case my ipod nano.
Solution, Volume level highest level, then "OFF and equalizer ng Ipod mo", set the equalizer of your Fofi sound system to Rock, the Treble to 2, the mid to minus 2 and the Bass to 5 ( this will really depend on your taste ) then set your DSP to enhance front driver, para naka cocncentrate sayo ang sound.
It will of course also help if you change your speakers and add speakers at the back if you have a trend model since walang speaker yan sa likod.
Look back at earlier mods thread dito for various modifications sa sound system.