Personally, I find the larger touchscreen on my SD40 fast, easy, and accurate. I have no problem in navigating live, and the dials are as fast as the sliders on my Audya.

Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact