Kergos-1 is a MIDI VST tool designed specifically for use with the Korg ES-1 hardware sampler. The ES-1 sends NRPN MIDI messages and the Kergos-1 plug-in translates these so that you can use it as a MIDI control surface (you can have 49 classic MIDI controllers (0 to 127). There is also a tuner for each pad, channel change and editable labels for each controller.