Follow up question: Is there a way to wirelessly use Airtunes and internet

Question

I had marked this post as resolved, but things have subsequently become quite 'unresolved.'
This is my original thread where I explain the problem and Tesserax provides an answer:
http://discussions.apple.com/thread.jspa?threadID=1702063&tstart=0
Here is where I am now:
I made the changes that Tesserax suggested, and everything worked fine for about an hour. Internet and airtunes worked simultaneously. Then, for no reason that I can discern, airtunes stopped working. It would no longer connect to remote speakers, giving me instead a -3256 error message. I scanned the forum for a fix, found that there have been firmware updates. I found that I had 6.3 installed on the AX, but I re-downloaded it just to be sure. No dice. I also made sure that the UDP was not being blocked in the Pref/Sharing/Firewall window. It wasn't. In fact there was no UDP button at all. Finally, when I try to use the Airport utility, both the base station and AX turn off and disappear altogether during the utility scan. They don't reappear until I close iTunes and utilities, and only then after rebooting themselves.
Any ideas about what might be causing all of this?
Thank you,
Peter

Answer 1

Yes, you can do both at the same time, by reconfiguring the AirPort Express Base Station (AX) as a "wireless client."
Either connect to the AX's wireless network or connect directly, using an Ethernet cable, to the Ethernet port of the AX, and then using the AirPort Utility in "Manual Setup" mode, make the following changes:
AirPort > Base Station
o Base Station Name: <rename or leave default>
o Base Station Password: <enter desired password>
o Verify Password: <re-enter desired password>
o Remember this password in my keychain: (optional)
o Set time automatically: (unchecked)
AirPort > Wireless
o Wireless Mode: Join a wireless network
o Network Name: <existing AEBS's wireless network>
o Wireless Security: <select the encryption type of the existing wireless network>
o Wireless Password: <enter the existing wireless network password>
o Verify Password: <re-enter the existing wireless network password>
Music
o Enable AirTunes (checked)
o iTunes Speaker Name: <enter desired speaker name>
o iTunes Speaker Password: (optional)
o Verify Password: (optional)
o Click Update to write the new settings to the AX
In iTunes:
iTunes > Preferences... > Advanced > General
o Look for remote speakers connected with AirTunes (checked)