Optigan guru Pea Hicks shared this video tutorial for programming the Casio VL-1 VL-Tone synthesizer:
The VL-1 is a strange hybrid calculator/synthesizer. It was the first instrument in Casio’s VL-Tone line. It’s a very limited device, but has been used iconically on tracks like Trio’s Da Da Da:
Here’s what Hicks has to say about the video:
Quick improvised tutorial on how to program sounds in “ADSR” mode on the Casio VL-Tone.
I forgot to mention that the sound selector has to be set to “ADSR” for this to work. Also, once you’ve programmed your sound in, it will be held in memory until you change it, even if you power the unit off.