I am trying to buy either the Denon DNX 400, 800, or the 1500 mixer. I bought a couple of DNS 5000 disc players. My question is concerning the ipod. Do I need a mixer with digital audio in and/or out. The guy at Abrakadabra DJ equipment store, steered me away from the 1500 because it ran hot and not cleaner than the other two. The DNX 400 has two digital audio outs, one of them optical. The DNX 800 has two also but no optical. Can I plug and ipod to the back of one of these and: 1. Be able to mix from the ipod. 2. Be able to use it as a hard drive to record all of my old records by connecting it to the mixer, and playing the records on a turntable with a digital out. Does the ipod has a digital out signal?