MidiKeys

MidiKeys is a software that provides users with a convenient little keyboard on the screen that enables them to play MIDI notes using their computer keyboard. The keyboard layout is intuitive with the flats (black keys) located on the row above while the octave below is on the row starting with 'q', and the digit row serves as that octave's flats.

Moreover, the software allows you to choose a MIDI source, and as you play notes, they will be displayed on the keyboard. Additionally, you can use your mouse to click on the keys on the screen to create sounds. The keyboard's octave starting at middle C (note 60), spans from the keys 'z' through ','.

However, to hear the sound when you press keys, you need to connect MidiKeys to a synthesizer of some sort, either a softsynth like SimpleSynth, or a hardware synth connected through a MIDI I/O box. It's important to note that MidiKeys doesn't have the capability to produce sounds on its own.

In summary, MidiKeys is simple, easy to use and very helpful for individuals looking to create beautiful music using their computer keyboard or while visually watching the notes being played on the screen. It is highly recommended to connect it to a synthesizer to fully appreciate its features.