I wanted to get those cables for the iPod touch that are used for hooking your ipod up to an external audio source (car, surround sound, etc.). I know they sell a cable that looks the same on both ends and is pointy on both ends (not square like the ipod charger). My surround sound has a specific port for the ipod and this port is also round. My question is, if I buy one of those cables and plug it into my DS or PSP and then plug it into my surround sound, will that work as well? Thank you.