Something else I noticed. Not only are the Ketron drums very good, but they are mixed (at least from the camcorder audio) quite a lot hotter than most arrangers default mixes are...

To be fair, you pump up MOST arrangers to that level of drums, and they are going to sound pretty live. It dismays me how much in the background many manufacturers (I must say, especially Yamaha) tend to mix the drums.
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An arranger is just a tool. What matters is what you build with it..!