MATRIXSYNTH

Korg Poly 800 with filter-control-knobs

YouTube via moogfreak. I'm guessing this is the MOOG Slayer Mod.
"Hello. In this video I will show you my selfmodified Korg Poly 800. I have added two knobs for filter-control - one for the cutoff and the other one for the resonance. On the back of the synth you can see a switch, which activates the new knobs. In this video you can see and most important hear how it works. The sequence in the beginning and at the end I have programmed on the Poly 800`s build-in sequencer. In the middle I`ve tried to play "Emerson, Lake & Palmer`s" "Aquatarkus", which Keith Emerson has played on his large Moog Modular. For this sound you need three oscillators per note, so I have done this with the Poly 800`s "chord memory"-function. As you can hear - it works very well. But I`m not as good as Keith. :-) Please excuse the pumping compressor/limiter from my videocam."

Girl Goodbye Home Video 1986

YouTube via Wolfy101. KORG Mono/Poly, Roland JX-8P?
"The the Archives of 1986, a series of video clips of the adventures of Bob and his gang having a blast in 1986. This one is set to the music of Toto's Girl Goodbye."

KORG Mono/Poly

via this auction

Two videos linked in the auction below. Note the videos are not the one for sale.

Tom Sawyer on Korg
YouTube via Wolfy101

The Korg Monopoly (part 1)

The Korg MonoPoly (part 2)

YouTube via AutomaticGainsay

Altair 231

images via this auction
"It was made in USSR at Zhitomir factory "Estradin" in April of 1986. The instrument consists of four main blocks of sound synthesis - Generator, Mixer, Filter and Contour. Synthesis is based on 3 master oscillators (each of them with different parameters of registers) waveform, frequency modulation. There is also a generator of white & pink noise. Low-pass filter with main parameters gives the possibility for keyboard tracking. Portamento adjustment knob is provided. To tune a pitch the tone signal is used (440Hz) It provides a linear input to connect an external sound source to Altair. Output and input sockets are 1/4" jacks." Audio at the aution while it is up.