Computer Sound and Airport Express out of Sync

Hi, i have a W7-Computer in the living room connected to the Hi-Fi system and the TV and several Airport Express to stream the music to other rooms (e.g. kitchen). Till recently i used a very old Stereo-Amp and everything was fine, the music in the living room and in the kitchen were perfectly in sync. Now i had to change to a new Home Cinema Receiver (ONKYO TX-NR609) and probably because of the data processing the Receiver does there is a delay, so that the music in the kitchen is slightly ahead of the one in the living Room. I tried different connections between Computer and Receiver (now using optical-link) and different music modes the receiver has (Stereo, Direct, Pure Audio) but didnt manage to sync it again. Does anybody have an idea? Is there a way to delay the transmission from iTunes to the Airport Express, in order to leave the Receiver enough time to process the music?

Use the analog output.
The AX has an a terrible flaw: optical delay.
Notes:
Apple should be able to update this with software. Apple?
I just tested this today with multiple recievers (onkyo TXSR508, sony STR-DH520).
Also: be sure your reciever is not set to delay audio. It sounds like you may have already checked this b/c you mentioned pure audio (which is only for european models?): http://www.us.onkyo.com/model.cfm?m=TX-NR609&class=Receiver&p=d. Other people have had this problem and have fixed it by configuring a/v sync.
See https://discussions.apple.com/message/15785854 for details on my issue.

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