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Mike I think this is fairly close Amazon.com: Optimal Shop New USB 6 Channel External Sound Card 5.1 Surround Adapter Audio S/PDIF for Laptop: Computers & AccessoriesCould you please post links to both items
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Amazon.com: Frisby FS-5020BT 5.1 Surround Sound Home Theater Speakers System with Bluetooth USB/SD/AUX and Remote: Electronics
Animation sorry I couldn't be any more helpful mate and to be honest I would be using a set up like mine with just a stereo cable running from the machine to the sound system.
Anyway someone might come up with something. It is a pity the audio on the HDMI cable couldn't be utilised somehow eh?