The Casio CTK-4200 is a 61-key portable electronic keyboard which has a large backlit display with notation andfingering display, boxed keys, an integrated Casio Step-Up Lesson System, uses an AHL sound source, Rhythm Editor, Sampling, and DSP Effects. The CTK-4200 has 600 preset tones, as well as 8 user sampled tones, 180 rhythms, 162 songs, 305 Music Presets, 2 digital effects, 48-note polyphony, a layer/split function, 3 levels of touch-sensitivity, and a 6 track sequencer function. The Casio CTK-4200 has a Rhythm Editor that can edit existing rhythms