Oh, and here's a tip for players of light, portable arrangers that may have a problem with excessive 'bounce'......
Get some 'Heavy Duty Velcro' - the kind that is hard plastic for BOTH sides (this works best, but is harder to separate - you CAN use regular heavy duty cloth velcro, but it wears out faster) and attach to the stand and keyboard so they mate together solidly.
Now, the stand and keyboard are one unit, and MUCH harder to make bounce.......
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An arranger is just a tool. What matters is what you build with it..!