You have to understand the inherent craziness in pooh-poohing someone ELSE'S needs for improvement in a product by saying that the line is already a "huge selling success" and "they must be doing something right & the customers love it or they wouldn't buy it", and then going straight ahead and listing YOUR OWN needs in this apparently perfect product

Either the product needs improvement, or it doesn't. It is egotistical beyond belief to assume that YOUR needs are legitimate, but anyone else's that you don't agree with are unnecessary. The simple fact that even those with the highest regard for this product can see areas where it could be improved. If they are allowed to list their needs without knee-jerk "it's already perfect' tripe poured down their throats, why do the rest of us get such a hostile response?

If it could do with "an adjustable screen, a better Vocal Harmonizer, another pedal input, and more effects blocks. Also, the DSP Variation buttons moved to the left side", what is SO wrong with asking for a better keybed, and even a longer one...?

Or is it that all YOUR needs are so much more, how should I put it, IMPORTANT than mine (and many, many others)?
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An arranger is just a tool. What matters is what you build with it..!