This is not a "stock" VL-Tone. The VL-Tone is a small (approximately a foot long) toy digital synthesizer, a real cheesy sounding synth with "mini-keys", about half the size of a standard keyboard. It actually didn't start out as a keyboard at all, but as a calculator with a keyboard attatched to it and a few preset sounds. In An Interview With Dr. Joseph Paradiso, Joe describes how he came about hooking this VL-Tone up to his giant modular system:
"I had a Casio VL-Tone, and I cut it apart, found the waveforms, made this thing. I put a full-size keyboard on it, made everything remotely
triggerable, and found all kinds of intermediate audio and control signals coming from the internal ASIC that I made available to the outside world. It can make some very un-Casio sounds."