Actually, the sliders on my G70 are some of the best thought out I have ever seen. For starters, they double as Hammond drawbars, so they are white and brown (BBWWBWBBW), which makes grabbing the right one on stage a snap. A bank of 8 or 9 identical ones can be a lot harder to get the middle ones right (I have a K2500... trust me!).
Secondly, the values do not jump the second you touch the fader. You have to take it THROUGH the preset value (which is shown on the graphic representation on the touch screen) before the value moves. No abrupt changes!
Then a couple of buttons to the left toggle between volume/pan and Chorus/Reverb (including overall amounts of Chorus/Rev on that page) and buttons to the left toggle between Keyboard Parts and Song/Style.
I can get to pretty much anything I need in a hurry close to instantly. I prefer it enormously compered to the Yamaha's inc/dec buttons, and to the Korg's bank of identical faders on the left side (being in the middle allows either hand to control it).
Like I said, I have a BCF2000, and have never felt myself slowed down by any task enough to need to go to the bother of programming and connecting it to the G70. Of course, if you don't have sliders, sure... but, other than the motorized aspect, there are MUCH cheaper fader and knob controllers out there...
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An arranger is just a tool. What matters is what you build with it..!