From Keen On Keys.

The VL-10, released in 1982, is the smallest keyboard made by Casio. It’s a mini version of the famous VL-1 and has some of it’s features. It’s monophonic, has 29 keys, 3 tones, 10 rhythms, a demo melody, a sequencer and a calculator. But it’s missing the ADSR function, octave switch, volume control and output jack. It has two small piezo speakers and a rather beepy sound.

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0:00 Intro
0:25 Overview
3:00 A Look Inside
6:32 Tones
7:49 Rhythms
8:31 Sequencer
11:50 Conclusion
12:50 Demo Melody

Listen to some tracks on Soundcloud: https://soundcloud.com/user-229361059