MIDI Keys is a minimalistic little nifty tool for MIDI musicians. It displays a visual keyboard on screen and lets the user interact with mouse, keyboard or external MIDI controller. Furthermore it lets you redirect the output to any MIDI port or the internal MIDI Synthesizer. You can use MIDI Keys to make your computer's keyboard act as MIDI controller (Soundtracker style), a patcher when redirecting MIDI or just to display the played notes. It also makes use of libprefs if available and supports funky roColor drops.