MidiKarval has released MidiStation, a flexible MIDI processor VST plug-in for Windows. It has two sections:

1. The "main section", where you can set the transmitting channel, the program and the volume for 4 different VST instruments (or for 4 instruments in a multi-timbral VSTi) and you can change the playing instrument simply moving a knob or a slider on your MIDI keyboard sending a specific Control Change number (CC #83 is the default one).
2. The "zones section", where you can choose the playing instrument(s) through the buttons on the left and set for each one the notes range (through the "low limit" and the "high limit" knobs), transpose them of +/- 3 octaves and determine if CCs (sustain pedal, pitch bend, modulation wheel, etc.) must be filtered or not. So you can create split or layering situations involving two or more of the 4 instruments.

You can pass from the "main section" (where you play a single instrument) to the "zones section" (where you can play more split or layered instruments ), and vice versa, on the fly, through the "On/Off button" (this button, as well as the other buttons and knobs of MidiStation, can be assigned to specific CC messages through the host). The different settings can be saved in each one of the 128 memories (programs) of MidiStation.

MidiStation costs €15. A demo version is available.