All Korg has to do is to go back to having a mute button at the bottom of each slider, as they did on the i30. None of their models since then have had this simple solution. Of course, none of this applies to the Pa600 or Pa900, but would be a godsend on the Pa3X and any subsequent multi-slider keyboards.

With the mute buttons you could knock out a single track, or a bunch of tracks simultaneously, if you wanted to.