Hi, I have been researching ways to add an AUX or USB into the command 2.5. The Tape to AUX connection failed no sound. There're boxes out there to replace the CD changer but not affordable at the moment. Other possible cheap alternative is to use my spare Sony Head unit. It it straight forward to link the ISO connectors to the existing connections Power and Speaker ISO going to the command? I have seen a similar thread on this but with command 2.0 in W210 and fitted into the astray fixture. Unfortunately I can not find the article for the installation. Any advice please?