i wonder if yr HU on gen2 cps hav the socket for the CD changer
if there is then see if u hav the AUX in funcion
if hav then u can buy ear phone cable mod on it

i did that on my neo in order to play psp in car when really bored:P
of coz the quality may lose to CD in sound quality o even FM -.-

from my opinion la
coz i feel i hav to turn louder for AUX in from my psp n FM no need that much

u can see if there's accesories
o u juz buy a ear phone cable
connect to yr AUX source

then try the wiring to yr blaupunkt plater cd changer socket

no need find socket
juz get a use ear phone that connect connect mp3 o what

cut it out n use the wires try connect to yr cd changer input socket
hav to try 1 by 1 in order to match the signals
left n right