YouTube via neandrewthal "The melody is created by two VCO's, one being fed the CV out of the x0xb0x sampled second clock pulse and the other one, the same thing sampled every third clock pulse. They go through a lowpass filter which is opened by an envelope every third clock pulse and on to the neural agonizer to spookify things." There's a KORG Polysix in there as well.
YouTube via ipnoteca "hello, here is an experiment with old and new gear. all the sound you hear is made using an EMS SYNTHI, KORG MS20,ROLAND SPACE ECHO except for drum played by IPOD TOUCH with BEATMAKER 1.3 apps.
Interesting that Yamaha went with "Digital Algorithm Programmable Synthesizer" rather than FM in the label description. Algorithm referred to the various combinations of operator modulation pictured in the middle shot. In the same way you picked your oscillator waveform in analog and PCM based digital synths, you picked an algorithm in the DX7. You'd then edit from there.
"ONE OF THE FIRST ONES MADE, hence no midi, but it works great with any midi to cv/gate converter. Sounds like a 303 but can do so much more with the two oscillators, ring mod, osc. sync, lfo , filter FM. LFO has several different wave forms over the standard, like random and S&H, great for whacked out filter sweeps"