one of the major problems with the Korg PA800 and the PA600 and a key reason why i would never buy one is the lack of the physical sliders . If you are a live player and i primarily am, then you cant alter the balance of the instruments in the mix immediately or as readily without physical sliders. Pressing buttons to reduce or increase the volumes in the mix is just not a credible alternative. Similarly if you play oragan at all it is virtually impossible to alter the drawbars in realtime like you would a real organ without the physical sliders. Although the later keyboards have DNC and the pa1x does not i have not been tempted to change my old workhorse just yet for very good reasons.