DF_Colins_4xSeq

YouTube via hillbillyshaman. "4 channel 10 step sequencer with lag."

4x10 through TAMA TechStar

Casio CZ-101

images via this auction

"The CZ-101 is a 4 octave, 49 note digital synth with MIDI capabilities. It features 16 preset and 16 internal banks as well as an external cartridge. It uses phase distortion, 8 waveforms and ring+noise modulation."

"with the original Box, power supply and manuals"

Roland PG-10 programmer for linear synthesizer

images via this auction

Future Retro Revolution

images via this auction

Note the F R on the side panels.

Studio Electronics Orion

Link

via digitizer

GAKKEN SX-150 MIDI MOD

You can find details on the mod in Japanese here. In Googlish

via HobbyMedia.it - be sure to check it out for more.

2 ARP 2600s

images via this auction

Looks like they went for $7500. Both have the 4012 filter, one has the earlier 3604-P keyboard

10 Step Sequencer

YouTube via hillbillyshaman. You can find more of hillbillyshaman's videos here.
"10 Step Sequencer Based on CMOS and PLL"

Patchable Synthesizer

YouTube via hillbillyshaman

LIVEWIRE AFG, PLAN B M14, SERGE VCO

LIVEWIRE AFG

YouTube via cray56