hmm..

read the instructions on the above page how to extract cloop compressed ISO..

the step when you are chrooted.. there you can put files in rc.* but I'd recommend something else to you..

if you won't remove KDE you can put symlink to xmms in /etc/skel/.kde/Autostart/

it will start up on boot. If the playlist is always the same you could create simple script like this

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#!/bin/sh
xmms -p /path/to/playlis.m3u

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and put in the above directory.