older model of panasonic (made in japan) has 1/4 size aux input in front of the panel
i saw a few still being sold brand new at shops
i think for your case, this type of aux-in HU is the one you should look for
easier to plug. unplug your portable player

cant you source sony xa-300 adapter locally?
thats the easiest solution for your case

the mod youre talking about will be too troublesome
you need to design a device that acts as a mock changer in between you sony HU and aux source - sony unilink and signal at the inputs, then outputs to iriver
were talking about a circuit designing here
plus where are you going to get the unilink bus connector here?
but if youre up for it
try to email this guy - matt dralle
dralle@matronics.com
hes been playing with sonys and unilinks for years
his effort -
http://www.matronics.com/4kcontrol/

This post has been edited by malutapimau: Aug 27 2005, 09:46 AM