Is there a way to avoid buying the Sonos bridge but still be able to enjoy the benefits of using Sonos iPod touch app and using the WDS functionality of the Airtunes to replicate it? Basically, I'm asking if i have a NAS and a couple Airport Expresses running Airtunes can I avoid buying the Sonos system? I hate that my computer needs to be on and running iTunes to use the Remote app on the iPod touch. THanks.