Here's the information on both, the CD-1200 and aux in.
-With the CD-1200 cable, you will be able to search/play music in your itouch through the deck. But this cable will not charge your itouch unless you get an firewire power adapter because it was design prior to Apple USB charging standard.
-With the AUX input, you will have to navigate with your itouch to play music. This is like a universal adapter sorta speak.
You can buy the cable here:
http://www.sonicelectronix.com/item_...r+CD-i200.html