Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Note this a re-list of the FS1R posted here.
The price is lower. If you do a quick eBay search for other FS1Rs you'll find that some go for astronomical prices. The reason likely is because the FS1R in incredibly deep offering Yamaha's unique Formant synthesis as well as an 8-Op FM engine. The DX-7 only had 6 Operators. The FS1R can load DX7 patches but it is capable of far more complex sounds. There is also an iPad editor for the FS1R created by yours truly.
Wednesday, May 06, 2015
Signed Meng Qi Sidrassi Qin Custom 7 VCO Analog Banana I/O Modular
Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Update: re-listed here.
New pics of the signed Meng Qi Sidrassi previous posted here. Details captured in that post. This one is currently up for sale.
via this auction
Update: re-listed here.
New pics of the signed Meng Qi Sidrassi previous posted here. Details captured in that post. This one is currently up for sale.
Casio Sk1 Circuit Bent by Diabolical Devices
Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Update: re-listed here.
"This vintage Casio SK-1 was diabolically modified and circuit-bent by Diabolical Devices, right here in the USA! RCA jack patch-bay with 1/4 in output"
via this auction
Update: re-listed here.
"This vintage Casio SK-1 was diabolically modified and circuit-bent by Diabolical Devices, right here in the USA! RCA jack patch-bay with 1/4 in output"
Glitchmachines Circuit Bent Syntax cataract
Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Update: re-listed here.
"Unique creation by GlitchMachines.
Originally a vintage Texas Instruments Touch & Tell learning toy.
Now it has a 3 color unique paint job, a bunch of switches, a knob and has been rechristened "Syntax Cataract".
100% fully functional. Runs on 2 "D" batteries (included, but not new).
Features:
- 20 glitch switches
- Pitch dial knob
- Reset and Speaker Cut switches
- Standard 1/4" output jack
Includes:
- 2 hard-to-find learning module cartridges."
via this auction
Update: re-listed here.

Originally a vintage Texas Instruments Touch & Tell learning toy.
Now it has a 3 color unique paint job, a bunch of switches, a knob and has been rechristened "Syntax Cataract".
100% fully functional. Runs on 2 "D" batteries (included, but not new).
Features:
- 20 glitch switches
- Pitch dial knob
- Reset and Speaker Cut switches
- Standard 1/4" output jack
Includes:
- 2 hard-to-find learning module cartridges."
Roland XP-80 Training - hosted by Nick Cooper
Published on May 6, 2015 perfectcircuitaudio
Roland's video training manual for the XP-80.
http://www.perfectcircuitaudio.com/
Perfect Circuit Audio on eBay
Roland XP-80 Training - hosted by Nick Cooper (Part 2)
Published on May 13, 2015
Duophonic Modular Synthesizer
Published on May 6, 2015 darksideothetune
"2X TipTopAudio Z3000 Oscillators into The Harvestman Maglorithm being enveloped by Intellijel Dual ADSR into Malekko Borg Dual stereo. Synthesis Technology E350 into wave shaper FM on Z3000's. Notes and envelopes controlled by Make Noise Pressure Points."
GAKKEN SX-150 MARK II / MK2 ANALOGUE SYNTH, WITH MIDI-IF INTERFACE
Note: Auction links are affiliate links for which the site may be compensated.
via this auction
"The Analogue Synthesizer SX-150 MK2 is quite an advanced little synth. With multiple controllable parameters, line in and out and a four octave range, it’s an amazing piece of kit. The Analog Synthesizer SX-150 Mark II uses an electrode stylus to play tones, is battery powered and is a quality piece of kit.
Also this auction includes a MIDI-IF controller, this means you can plus the Gakken in and play this with a midi keyboard. This adds features of tune, modulation rate and glide to the Gakken and like the Gakkken is battery powered."
According to the QA in the listing, the MIDI-IF "was custom made by beatnic.jp in Japan, the model of this controller is a MIDI-IF for the Gakken SX-150 mk2."
You can see another model of the MIDI-IF for KORG's Monotron here.
They also made The Mountain synth. See the beatnic.jp channel label at the bottom of this post for more.
via this auction
"The Analogue Synthesizer SX-150 MK2 is quite an advanced little synth. With multiple controllable parameters, line in and out and a four octave range, it’s an amazing piece of kit. The Analog Synthesizer SX-150 Mark II uses an electrode stylus to play tones, is battery powered and is a quality piece of kit.
Also this auction includes a MIDI-IF controller, this means you can plus the Gakken in and play this with a midi keyboard. This adds features of tune, modulation rate and glide to the Gakken and like the Gakkken is battery powered."
According to the QA in the listing, the MIDI-IF "was custom made by beatnic.jp in Japan, the model of this controller is a MIDI-IF for the Gakken SX-150 mk2."
You can see another model of the MIDI-IF for KORG's Monotron here.
They also made The Mountain synth. See the beatnic.jp channel label at the bottom of this post for more.
Welcome to the House of Jomox - Airbase 99 Splash Screen
Note: Auction links are affiliate links for which the site may be compensated.
SN 9925-0491 via this auction

"Jomox Airbase 99 Analog Drum Machine Synthesizer - Latest OS (1.15)"
SN 9925-0491 via this auction

"Jomox Airbase 99 Analog Drum Machine Synthesizer - Latest OS (1.15)"
Sequential Circuits Pro-One SN 2909 Used for KORN?
Note: Auction links are affiliate links for which the site may be compensated.
via this auction
via the seller:
"As a record producer, I have used this keyboard in countless productions over the years, including three singles for the mega group KORN.
Cosmetically, I would almost dare say she may be in near perfect condition. The only place that I can find a small scratch or two, is on the bottom underside of the keyboard. (See pictures). All nameplates are perfectly intact without a scratch. No scratches whatsoever anywhere on the top faceplate or keys.
This Pro One is also in excellent working order and sounds and plays amazing. I guess if you wanted to get extremely picky, you may be able to find a knob or two on the front that are a bit scratchy sounding when turning them. Feel free to message me, I could even text message you a video of me playing it. Showing that all keys work and it sounds amazing.
The only reason I am selling it, is because I have not been producing much dance electronica oriented music the past few years. I am primarily producing acoustic music."
Again, more interesting bits of individual synth history. Not sure how you would confirm this though.
via this auction

"As a record producer, I have used this keyboard in countless productions over the years, including three singles for the mega group KORN.
Cosmetically, I would almost dare say she may be in near perfect condition. The only place that I can find a small scratch or two, is on the bottom underside of the keyboard. (See pictures). All nameplates are perfectly intact without a scratch. No scratches whatsoever anywhere on the top faceplate or keys.
This Pro One is also in excellent working order and sounds and plays amazing. I guess if you wanted to get extremely picky, you may be able to find a knob or two on the front that are a bit scratchy sounding when turning them. Feel free to message me, I could even text message you a video of me playing it. Showing that all keys work and it sounds amazing.
The only reason I am selling it, is because I have not been producing much dance electronica oriented music the past few years. I am primarily producing acoustic music."
Again, more interesting bits of individual synth history. Not sure how you would confirm this though.
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH