Itunes won't play anymore through external sound system

My mac functions as a Protools recording studio. The hardware (a Digi002 system) attaches to my G5 by firewire. Until recently, itunes worked just fine playing through this external system. I'd simply go to system preferences, change the sound inputs and outputs to Digi002.
These days I can still get all of my pro music software to play through this external Digi002 system. But something has gone amiss with itunes. It doesn't matter if itunes is already open, or not yet open. If I go to sound preferences and switch it to DIGI002, itunes ONLY plays through my internal compouter speaker. And if i go back to the sound preferences, i find that the external audio choice had been unchecked, as if by some function within itunes itself.
i have asked this same question on the Protools forum. Respondees give mixed answers, but basically say, yes it used to work, and no, it no longer works. Some say it WILL work, but you have to fire up your sound system BEFORE you turn on your computer. That is a totally disfunctional "solution" for my situation. Who wants to keep a sound system on all day long, when I may not use it for several hours at a time?
So what's going on here? And what did I install that made itunes suddenly not function with my external system? I strongly suspect it may be some newer version of itunes itself. If so, is there some workaround utility that will let me re-connect itunes to the Digi system? any help is appreciated.

Hate to do this, but we've gotta start with the simple **** first, and work our way up. The volume control in iTunes isn't turned down, is it?
Aside from that, you should launch Quicktime Player, go to File - Open, and open one of your iTunes songs in that, and see if you can hear sound there.

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