Sorry, Bill, but the speed of the interface has nothing to do with how fast you can get data into the RAM...

Most current arranger samplers (and several WS's) can't even load it up at USB 1 theoretical speeds. There's a data pipeline that chokes it off LONG before it reaches the interface speed.

Only the computer based arrangers have anything close to the interface speed load-up.
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An arranger is just a tool. What matters is what you build with it..!