Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
Friday, December 12, 2025
Sequential Circuits Six-Trak Analog Polyphonic Keyboard Synthesizer SN 001152
Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
via this listing
Additional Perfect Circuit listings
Roland TR-707 Rhythm Composer Drum Machine SN 583400
Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
via this listing
Additional Perfect Circuit listings
Waldorf Miniworks 4-Pole Filter SN 840421427
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
via this Reverb listing
Kawai K3m w/ Original Box
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing

"For sale is a collector-grade Kawai K3m in excellent condition, the iconic 1986 hybrid rack synthesizer known for its unmistakable blend of digital additive waves and warm analog filters and this one is among the nicest examples you’re likely to come across.
This unit has been exceptionally well cared for. The front panel, buttons, and display are all clean, responsive, and in excellent shape. The chassis shows only very light surface scratches consistent with normal aging and nothing that affects performance or presentation. No rust, no dents, no rack rash. Everything functions exactly as it should. This K3m includes the original box, which is extremely uncommon and makes it especially appealing to any collector who values originality and provenance.
If you’ve been waiting for a near-mint, investment-worthy K3m that has the look, feel, and reliability of a top-tier example, this one checks every box.
The K3m has gained significant interest in recent years thanks to its unique voice architecture: additive digital waveforms running through warm analog filters. It occupies a sonic space very few synthesizers, and certainly no plugin, can convincingly emulate. It’s pure mid-’80s character, from shimmering pads to darkwave textures to cutting synth-pop leads.
Collector Highlights:
• 1986 original in exceptional condition
• Very minimal wear
• Fully functional with no operational issues
• Includes the original box
• Original buttons, screen, and panel components
• Hybrid architecture: 32 digital additive waves → analog low-pass filter
• A historically significant Kawai design with growing collector interest
• Perfect for studios, synth enthusiasts, and vintage rack collectors"
via this Reverb listing

"For sale is a collector-grade Kawai K3m in excellent condition, the iconic 1986 hybrid rack synthesizer known for its unmistakable blend of digital additive waves and warm analog filters and this one is among the nicest examples you’re likely to come across.This unit has been exceptionally well cared for. The front panel, buttons, and display are all clean, responsive, and in excellent shape. The chassis shows only very light surface scratches consistent with normal aging and nothing that affects performance or presentation. No rust, no dents, no rack rash. Everything functions exactly as it should. This K3m includes the original box, which is extremely uncommon and makes it especially appealing to any collector who values originality and provenance.
If you’ve been waiting for a near-mint, investment-worthy K3m that has the look, feel, and reliability of a top-tier example, this one checks every box.
The K3m has gained significant interest in recent years thanks to its unique voice architecture: additive digital waveforms running through warm analog filters. It occupies a sonic space very few synthesizers, and certainly no plugin, can convincingly emulate. It’s pure mid-’80s character, from shimmering pads to darkwave textures to cutting synth-pop leads.
Collector Highlights:
• 1986 original in exceptional condition
• Very minimal wear
• Fully functional with no operational issues
• Includes the original box
• Original buttons, screen, and panel components
• Hybrid architecture: 32 digital additive waves → analog low-pass filter
• A historically significant Kawai design with growing collector interest
• Perfect for studios, synth enthusiasts, and vintage rack collectors"
Blue Roland SH-101
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"Clean, Serviced and calibrated sh-101! Clean battery compartment. New power supply included. Plays and sounds great. There was a small crack under the keys which is strong and reinforced - that's the only thing that kept us from listing as excellent.
Tubbutec Midi, which we stock, is available for install for a fee."
via this Reverb listing
"Clean, Serviced and calibrated sh-101! Clean battery compartment. New power supply included. Plays and sounds great. There was a small crack under the keys which is strong and reinforced - that's the only thing that kept us from listing as excellent.
Tubbutec Midi, which we stock, is available for install for a fee."
Sticker Covered Roland Juno 60
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
via this eBay listing
Fixing A Cute Synthesizer - Schober Tunesmith
video upload by LOOK MUM NO COMPUTER
"Another oddity from the past!
Download the sampler VST insterument! a whole lot more! and support these projects whilst you are at it here! :- / tunesmith-sample-140168907
Also full version of 'oh i do like to be beside the seaside'
Which also supports @THISMUSEUMISNOTOBSOLETE "
Casio FZ-1 – Installing the New OLED Display Kit
video upload by EMW Synthesizers
Addtional EMW Casio posts
"INFORMATION
The project works perfectly for normal use of the FZ-1, FZ-10M and FZ-20M. All menu screens, editing pages, sampling functions, parameters and general operation display correctly. Only a few fully graphical screens, such as Hand Drawing, Sin Synthesis and Graphic Envelope, may show minor pixel irregularities. This does not affect usability in any way; these functions continue to work normally and the issue is purely visual.
As I no longer have time to continue development, I do not plan to refine these small graphical details. Even so, the kit leaves the FZ fully usable, which is exactly what allowed me to bring my own FZ-1 and FZ-20M back to life and use them normally again.
FZ-1 Kit
For the FZ-1, we supply a complete kit, including:
A dedicated support with the logic board.
A second support with the new OLED display that fits perfectly into the original display mounting position.
Installation requires no soldering and no special skills. The kit uses the original FZ-1 mounting screws, and the entire installation can be completed in under 20 minutes.
Please watch the FZ-1 installation video on our YouTube channel for a full step-by-step demonstration.
FZ-10M and FZ-20M Kit
For the FZ-10M and FZ-20M, we supply a single integrated assembly including the support, logic board and display. This assembly fits perfectly into the original display location of the module.
Installation is very simple, requires no soldering, and typically takes around 15 minutes. The process is also demonstrated in the installation video available on our YouTube channel.
Pricing and Ordering
The price for the kit (logic board, display, supports and cables) is US$249.00 + shipping.
Christmas lights from OP-1 + Modular and Microcosm
video upload by Music4screens
"Super dusty signal through TASCAM portastudio for extra noise and analog sauce. Sound source OP-1 in reverse tape, processed by modular Sealegs and Microcosm out of the Eurorack.
The sounds evolves by itself in a way I couldn't control, and I loved it!
@teenageengineering @HologramElectronics @intellijel
#ambientmusic #lofi #ambientcuration #eurorackmodular #experimentalmusic"
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MATRIXSYNTH - EVERYTHING SYNTH
© 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






























