Back in 1981, Casio included a small, staple-bound booklet with every VL-1. This wasn't a manual full of technical jargon. It was a . Inside, you’d find simple, color-coded notation (often using the "Magic System" of letters above the notes) for 10-15 classic songs.

indicate whether to play an octave higher or lower. Programming Custom Sounds (ADSR)

: The recommended rhythm setting (e.g., Rock-1, Bossa Nova, or Waltz) and a suggested tempo range. Octave Setting

The songbook guides you through using the buttons. You can input a string of numbers representing the notes without worrying about the timing. Once the notes are saved into the internal memory, you press the One-Key Play buttons rhythmically to play the melody perfectly, regardless of which key you hit. Decoding the ADSR Codes