The software that will be doing the converting doesnt have to be for the Amiga.it can be for a PC and then one can burn the results to a CD and tranfer it to the Amiga...........I myslef do most of the heavy conversion processes on a PC, and then burn it ffor my Amiga
I don“t think you will be able to find a pc-program that supports CDXL. Maybe ANIM and IFF-sound if your luck :-)