Simultaneous digital & analogue sound output

Until recently I used to have a Powermac G5. I was able to have simultaneous sound output to the line out and digital sockets, but I find in my new Mac Pro (early 2008) this does not seem possible - you have to choose between internal speaker, line out or digital.
Although not a big deal, this is really irritating, as I have my main output as digital, where I play my music from iTunes on my HiFi via a 20m Toslink cable to a high End DAC connected to my amplifier, but when I want to use iChat etc, I just use my JBL Creature speakers. With the G5 I would just switch on the HiFi only when listening to music, but now I have to remember to go to the sound preferences to change the output from line out to digital when listening to music and vice versa when I want to do an iChat.
I'm just struggling to understand why this basic functionality was removed in the Mac Pro.

With an MIO card, this is not something that you will be able to do with a 10 KHz output rate. The way to accomplish this is to generate your analog output using your MIO card, and the digital signal with a PCI-6533 connected to the MIO card via the RTSI bus. The RTSI bus allows the cards to trigger together, and generate synchronous digital and analog output

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