Dom is using Linux to run the MS, no doubt with custom drivers for the hardware to get super low latency.

Linux is a FAR better OS than Windows of any flavor for the purpose of prioritizing the entire CPU towards it's music tasks...

BTW, what super low latency ARE you getting from the Edirol, Fran? And what OS are you using?
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An arranger is just a tool. What matters is what you build with it..!