You'll probably have to buy or make something to connect to the Sony to fool it into thinking it has a supported aux device connected. They make these types of adapters for a lot of head units. I don't know a specific place to get what you need though. A local car audio shop would be a good bet, but you should be able to find something by searching the web. You can also do searches in here as well as the Neo Car Jukebox forum over at www.funmprplayers.com (I remember a lot of people looking for and fiding adapters for this purpose for all sorts of head units).

The other alternative is to connect in the other supported method: You connect the pre-outs of your Sony to the AUX input of the empeg. You then use the volume control on the empeg. I went the first route however. My Clarion just blindly switches to AUX - it's not a control-related input.

Bruno