MATRIXSYNTH

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Not a synth, but definitely fun too look at.

"Comdyna GP-6 Analog Computer + Microhybrid I. Everything pictured is included. These are no longer made anymore. Complete info is available here: http://www.comdyna.com"

via the Comdyna site:
"The GP-6 carries on the general purpose analog computer as an old technology that stays forever young. Although the analog computer rarely computes in a manner that gave it its name, analog computing continues to thrive in the form of linear circuits. Analog computing fundamentals are the roots of linear circuits. The analog computer patch panel remains the only means of programming linear circuits, i.e. operational amplifiers into the endless number of analog circuit devices. With a GP-6 in the laboratory, stable, trouble- free signal conditioning, simulation, control, intrumentation, etc. circuits can be up an running in minutes.

Control laboratories are the primary installations. The GP-6 is the ideal starting point for teaching classic control system design. Working first with the GP-6, the student experiences not only the basic challenge of the control problem, but a hands-on development of the system physics into its math model, the patch panel programming of linear devices into interface and controller circuits, scaling analog variables and the use of simulation as a tool for both inductive and deductive analysis.

The GP-6 is also used in classroom demonstrations and advanced design projects where programmable simulations serve as linear and non-linear plants to be controlled. GP-6 simulations are high speed, continuous, and realistic stand-ins for testing analog and digital controllers and control systems.

Other than teaching, the GP-6 finds application as a handy, portable, general purpose instrument, the GP-6 patch panel a means to quickly program, as opposed to breadboarding, linear circuits.

Each GP-6 is a self-contained unit capable of simulating linear and non-linear systems of up to four state variables. Over 2000 GP-6 analog computers have been installed in over 400 university, government and commercial research laboratories.

USING THE COMDYNA GP-6 ANALOG COMPUTER, by Professor Ian Petersen, Department of Electrical Engineering, Australian Defense Force Academy, is an excellent presentation of programming and operating the GP-6.

The GP-6 Panel page offers a destailed description of the patch and operating panel functions."

For an analog computer with audio, see the Starkey Hearing Lab by clicking on the Starkey label below.

Korg MS-20

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KORG Polysix

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Yamaha TX81Z

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There are some good close-ups of the "TX81Z MEMORY CONSTRUCTION" print on top of the synth.

360 SYSTEMS SLAVEDRIVER GUITAR SYNTHESIZER

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"The item listed here is the bass version. This is a very cool and rare tool for the synth players and collectors out there. The Slavedriver was a guitar to control voltage converter for a synthesizer. You take the 360 System Slavedriver and connect it between your synthesizer and guitar and you are able to manipulate your guitar with the sounds produced on your synthesizer. It allows the guitar player to control any keyboard with CV input through your guitar.

The 360 Systems Slavedriver was one of the first units that allowed a guitar player access to the synthesizer world and all the insane sounds they make. The model we have for sale is a bass guitar version of the guitar interface and is meant to work with any 4 string bass guitar. It features a variable octave selector switch as well as several synthesizer and footswitch outputs. The Slavedriver for sale comes complete with the 4 piece magnet bass pickup which is needed to control the synthesizer sounds."

Voice of Saturn DIY

via this auction via Curious Inventor

"Loosely based on the Atari Punk Console with some custom tweaks and an LFO front end, this box makes a ridiculous amount of different sounds, all from three 555s. This is a kit version complete with knobs and case. It's open source (see the instructions and surrounding pages) and has small area on the pcb for easy circuit bending. Created by recompas.com. Complete assembly instructions are available. We also sell a completely assembled and tested version."

click on the Curious Inventor label at the bottom of this post for prior posts including video.

Arturia Moog Minimoog V

via this auction

Moog Taurus II

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"MOOG Taurus II bass synthesizer, footpedals, connector cable, and 2 patch sheets. One is labeled 'SOLO VI' and the other is labled 'Bass I'."