Optical audio in Lion switches off after 30 seconds

I have a new iMac 27" Computer purchased November 2010 with Snow Leopard on. I have upgraded to Lion OS the day it came out.
When I started using it, I noticed that the Optical steam (red beam) would switch off after roughly 30 seconds. I researched this issue and found that OS X powers down the Sound Hardware after 30 seconds if not used, as it is fine under Bootcamp with Windows 7.
So I used a program called Sound 1.0,1 to stop the Optical connection switching off, by playing a silent sound every 20 seconds. But now Lion does not support PowerPC programs by Rosetta, so am back to the original problem, that if the hardware has switched off, I miss the first 2 or 3 seconds of the start of the audio, like Skype announcing that some has signed in / out or on MSN as a message notification.
Any ideas to sort this annoying problem be most grateful.
Peter

Thanks for your help Andrew.
Have tried that and seems to be working at the mo (touch wood). See how it goes.
Can't tell you what a difference it is compared to the monitors speakers.
Thanks Again
Peter

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