Key bounce (for me) is where you have a flimsy stand, and as you play hard, the whole keyboard bounces up and down (and left to right) a little, or a lot! - very off-putting!
If all four wheels don't lock, it's going to tend to rotate round unless you wedge all the other wheels well (if you do more than just tickle the keys!)
[This message has been edited by Diki (edited 08-06-2005).]
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An arranger is just a tool. What matters is what you build with it..!