MATRIXSYNTH

MOOG Sonic Six Brochure from 1974

You can find the complete scans and write-up on Retro Synth Ads

Roland RS 09 VINTAGE ANALOG string synth

via this auction and this auction
"'Roland RS 09 is a keyboard mechanism that produces the sound of the strings as well as the rich sound of the organ. Equipped with a 2-channel output and an ensemble capacity, you can create a deep and wide range sound with a stereo or PA system. And with the external input jack, you can add the ensemble effect to the sounds of various electronic and electric instruments. In connecting RS-09 to other synthesizers (SH-1) , you can get a similar effect to a polyphonic synthesizer'
from the ROLAND RS-09 OWNERS MANUAL"

Analog Synth Lab Juniper 8

via this auction where you'll find audio demos while up. Not sure if they have a website. You can find their other emulations with audio via their other auction items. Emulations include the Prophet-5, Minimoog, ARP Odyssey and Roland SH-101.

"What Analog Synth Lab is all about is bringing the technology to you; those who are interested in making music and synthesizing but can't afford the old classic vintage synths or you just don't know where to start.

If you're a synth wizard or you're new to the whole thing; Analog Synth Lab will cater for your needs.

You can play the synths with your PC (qwerty) keyboard, a midi keyboard or a sequencer (both hardware and software sequencers supported) and tweak the knobs and relish in the sound of analog synthesizers.

If you have no knowledge about synthesizers then don't worry. There are lots of preset sounds so you can get playing straight away. And if you are feeling adventurous then twiddle with any of the knobs to see how it changes the sound.

Have a classic part of history in your computer and be a part of the electronic generation!"

Shruti-1 demo

YouTube via mutableinstruments. via Palm Sounds
"Playing with the Shruti-1 proto and a fat oscillator stack (osc1: pwm ; osc2: saw, slightly detuned ; square sub-oscillator mixed at 50%). Later, the volume of osc2 and the sub-oscillator is set to 0, and I scan through the waveform shapes (note that there's a fair amount of PWM routed to osc1)"

NOT NAMM: A Collection of Logic Modules via Ruin & Wesen

"There has been a lot of ideas being stewed around here at Ruin & Wesen. Some of these ideas come from the act of using digital logic as a sort of analog synth, patching between modules to create flexible signal flow. A lot of these modules have coalesced into what I've called the 'Cashbox', read more about it later. Technically it's not an analog synth but the way you work with it is sort of, well, analogous to... analog. This synth was inspired by what is known as a Lunetta synthesizer."
Full details at Ruin & Wesen