MATRIXSYNTH

Harvestman 9791 HERTZ DONUT

via this auction

"I know nothing about FM synthesis. But minutes after racking the unit I was getting killer one shots, leads and big-ass bass. You don't need to be a super scientist to use this thing. Tons of control. Racked only once, in great shape. Comes with Doepfer power ribbon and four mounting screws. Ships box in a box. Original box included. Also in the box will be five 17inch long 1/8 to 1/8 patch cables.

dual digital oscillator with internal modulation bus. voltage-controlled waveform discontinuity, internal pitch tracking with several lag settings. dedicated square wave outputs, and a multi-purpose gate/xor ringmod output.

specifications - main oscillator:waveform output (switchable between saw, tri and sine, 12-bit resolution)waveform discontinuity modulation variable square wave output hard digital synchronization input

modulation oscillator:
sine, tri or saw waveform
independent square wave output
selectable modulation frequency range
hard digital synchronization input
oscillator output internally patchable to main oscillator frequency (linear, thru-zero), amplitude, or discontinuity
internal modulation index voltage-controllable
variable-lag pitch tracking of primary oscillator
general-purpose gate output for monitoring internal tracking status..."

Harvestman Tyme Sefari Sound of Thunder Delay

via this auction

"Digi delay sound destroyer. Too much to try to describe. So many cool little features that add up to a really big amount of control. Goes from a straight up, clean digital delay to a "circuit bent" sounding, bit crushing, music mangler. You can reverse the sound going thru with a trigger or by hand. . . the list goes on and on. The Sound of Thunder (included) adds more destruction to the mix.

"the tyme sefari is expandable with a series of switches for "circuit bending" the behavior of the module, model 1973a "sound of thunder". these switches short out parts of the data and address busses, resulting in effects just like a modified casio sk-1. the glue logic within the tyme sefari is laid out in a similar way to the sk-1, so the changes in sound are quite similar. however, the front-panel operation of tyme sefari remains predictable when the expansion is active."

The TYME SEFARI will ship, box (original) in a box. Comes with six mounting screws, three 17inch 1/8 to 1/8 patch cables and the 1973a Sound of Thunder expander unit. Doepfer power ribbon and connecting ribbon for the Sound of Thunder to the Tyme Sefari."

Acorn BBC Micro Music 500 vintage synthesiser

via this auction

"'New' Condition. Includes;
original box,
warranty card (expired)
Tape
5.25" disc
User Guide
Music 500"

Anyone know more about these?

Update:
via umcorps in the comments: "This is a good source [new link here - not sure if it was the same content, so keeping original as well] for info about the Music 500 (which was my very first digital synth)"

and via David Anderson in the comments: Looking at the circuit board on Chris' site, it looks like the Music 500 box is a dedicated TTL digital synth. The two Advanced Micro Devices ICs are 2kx8 RAM chips. From the documentation, it looks like all those TTL devices make up the 'phase accumulator' digital oscillator described in this article"

Roland MC-202 w/ MIDI installed

via this auction

"It has been professionally modded with Synouse MidiJack, which allows you to control the synth with standard midi from your computer or another sequencer or midi keyboard. You basically get a smaller, more portable SH-101. The MC-202 can also revert back to standard mode, which allows you to sequence 2 CV parts... and sync it up using the Din Sync ports on the back... This is an amazing 202..."

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Roland Juno 60 Synthesizer

Roland Juno 60 "Warm Strings 1"

YouTube Uploaded by synthartist69 on Nov 21, 2011

"Nice warm analog strings from the Juno 60..."

via this auction

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Korg mono\poly mp-4 vintage synth

via this auction

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MACBETH Studio Sytems M5 modular synthesizer

via this auction
more pics

"This is the M5 (MKI), not the M5N (MKII).
The M5 MKI is more raw & dark sounding.
The M5N was said to have 'cleaner' signal path...
The M5 has been manufactured in quite limited quantities (less than 100?) and is now discontinued so this is a rare chance to get one.
Probably the fattest, darkest sounding modern analog synth."