Vl-tone troubleshooting- no output? : r/synthesizers
Casio VL-Tone 1, PT-1, VL-10, EP-10
Casio VL-1 - Part 3: The Synthesizer - YouTube
Casio VL-Tone (EMM Aug 81)
Pulp Librarian on Twitter: "The 1979 Casio VL-Tone: a combined calculator, synthesizer and sequencer the size of a half baguette. It may have looked like a toy, but it introduced a generation