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Virtual MIDI controller for Linux, Windows and OSX
VMPK is a virtual MIDI piano keyboard for Linux, Windows and OSX. Based on Qt and Drumstick the program is a MIDI event generator using the computer's alphanumeric keyboard and the mouse. It may be used also to display received MIDI notes.
...So you adjust the scrolling speed and time between new notes and then play each note before the application echos it back to you. It also scrolls guitar tablature, as can be seen in the video.
The keyboard and guitar models are linked so that playing a note on the piano keyboard (clicking a key) causes the guitar neck to display all the locations of the same note on the guitar neck.