Sound, rhythm, record! This digital keyboard has 37 full-sized keys with great action. Comes complete with sound library of instrument sounds, play-along rhythm accompaniments in many musical styles, and a record and playback function. FeaturesSound, rhythm, record! This digital keyboard has 37 full-sized keys with great action. Comes complete with sound library of instrument sounds, play-along rhythm accompaniments in many musical styles, and a record and playback function.