MATRIXSYNTH

MID-IF for SX-150

YouTube via MMTAKEDA55. "Adding MIDI-IF for SX-150 experiments"
The SX-150 recently came as a DIY kit in Gekken magazine.
There are a number of these up for auction on Ebay.

Yamaha CS1x Demo by Failed Muso - Pt.3

YouTube via FailedMuso
"Part 3 of my run through of some of my favourite sounds from the Yamaha CS1x. Come back soon for further parts in this and other series."

Octave CAT

images via this auction

"This is the SRM (series revision model) which was a further improvement on the original CAT and was made from 1978 on."

1974 Moog Price List

via this auction

Note the seller has more up here.

images via this auction
"This is a kit project from an electronics magazine in the 70's. The article was written by Don Lancaster, and the components were supplied by SouthWest Technical Products (SWTP). The modules have been professionally assembled, and are complete. What needs to be added is a power supply and a keyboard. This should appeal to those who are electronically inclined, and have an appreciation for 70's analog synth technologies and their sound. What remains to be done is quite simple, and straightforward. A copy of the article with instructions is included."

Roland SH-2000

images via this auction

Spectral Audio Neptune Analog Synthesizer

via this auction
"You're looking at the extremely rare and discontinued Spectral Audio Neptune Synthesizer. This is the first version, the second version is pretty much the same only with a power switch on the front and they made the thing ugly purple and not as timeless looking.... The Neptune is made up of 100% analog oscillators and moog-style 24 LP (and HP) filter.... The machine has 3 oscillators, 2 of which are Saw or Pulse and a third that is similar to a minimoog in that it can also become an LFO. The third OSC/LFO can modulate different parts of the synth, the 4 buttons on the right side shows this. There is also ring modulation, fuzzer/distortion, and individual tuning for the oscillators.

This machine works with both midi and CV/Gate, the midi can control a few things beyond notes such as the cutoff, slide rate, LFO Rate, modulation of OSC3, and so on. There is also a 303 mode, in which you can give notes accents... What I'll say about this that most people on the internet too will say which is this is a great monophonic synthesizer for getting one of a kind sounds, many of which are unique to this machine. This synth is easy to put off making music with because you get so caught up making new sounds with it. There is an external audio input, which is great if you want to run your other thinner (*cough microkorg) synths through a real analog filter to fatten it up. The Neptune is in great condition, some rack wear from bolting it down, along with a little scuff you can see over the word Fuzzer in the second picture. It comes with the Synth, AC Adaptor, and a blue instruction manual. To get the technical specifics of the machine, you can check out Spectral Audio's website..."

Synthesis by Herbert A. Deutsch

images via this auction
"'Synthesis: An Introduction to the History, Theory, & Practice of Electronic Music' book by Herbert A. Deutsch.

Printed in 1976. Softcover. 140 Pages.

This is an amazing book about analog synthesizers and early electronic music written by electronic music pioneer Herbert A. Deutsch, a close friend of Bob Moog, who even collaborated with Bob Moog on the first prototype of the Moog Modular Synthesizer.

This book is filled with tons of great information on analog synthesis, analog synthesizers, the amazing people that built them, and the musicians that first used them. A great book for anyone interested in the beginnings of electronic music.

There are a lot of awesome pictures of vintage synthesizers like the original Moog Synthesizer prototype, Moog Sonic VI, The MiniMoog, Moog Satellite, Moog Model 12 Modular Synthesizer, ARP Pro-Soloist, ARP Odyssey, ARP 2600, ARP Modular Synthesizer, EMS Synthi, EMS Synthi 100, and The Roland Series 100 Modular Synthesizer!

Also pictures of synthesizer pioneers Bob Moog, Herbert A. Deutsch, and Wendy Carlos!"

DIY MS-DOS Sequencer

via Synth.nl where you'll find more info another shot.

"It is a 286 PC with a 40 Mbyte harddisk and it runs MS-DOS 6.22 with Cakewalk installed. It has a build in keyboard, 9" screen and a midi interface."