aux output for Symphony cd player

Dear Friends,

i have 2005 Fabia TDI Ambiente, still using original symphony cd player as you can see the picture,

my question, i want to use my mp3 player in also my car,

i therefore investigate about how can i get aux output from preamplifier floor of my symphony cd player nowadays?if is there anybody who did it?

it will be made by myself,

would you please explain with the pictures as example below(it is belongs for normal tape recorder)?

thanks a lot for your kindly helps,

Musty