Korg SB-100 Synthe-Bass SN 750076

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via this Reverb listing

"I bought this from analogia.pl (i.e., Maciej Polak, check out his album 1977!) in 2022, serviced and converted to North American power. This synth is a little limited, but it sounds great and the portability can't be beat. It also has two features that (as far as I know) are unique to this model among early Korgs: the "bender" buttons and the "Phaser" waveform. As far as I can tell "Phaser" is a very nicely dialed-in pulse width modulation that sounds especially nice in the lower registers.

No major issues in testing, but two notes:

The output jack was a little intermittent when I started testing, but after working a 1/4" plug in and out of it the signal is solid. Guessing it was a little dirty and could eventually use a cleaning if you're handy. The "Traveller" slider is a little stiff around the center of its travel. All audio passes great, so this is really a "feel" thing and something I've also noticed on some (but not all) other early Korgs. In great cosmetic shape overall, but there are many little blemishes and signs of wear, which I tried my best to capture in the photos."

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Rare Vintage KORG KEIO (?) CHECKMATE Drum Machine

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via this Reverb listing

This appears to be the first one to be featured on the site. It looks a bit like the Wexler ROCKMATE. Teisco made a CHECKMATE keyboard. You can fhand a handful of posts mentioning CHECKMATE here.

Details via the listing:

"A vintage Checkmate drum machine, a true gem from the early days of rhythm boxes. This unit is as much a visual statement as it is a piece of music history: with its golden front panel and large knobs, it’s a guaranteed eye-catcher in any studio or collection.

Fully serviced: all electrolytic capacitors have been replaced, ensuring reliable operation.

Everything works as it should – all rhythms, switches, and controls have been tested.

Runs on a single 9V battery inside the unit, making it portable and hassle-free.

About the Checkmate

The Checkmate belongs to the family of early preset rhythm machines from the late 1960s/early 1970s, often linked with Korg’s DoncaMatic line. These units were designed for accompaniment but quickly became collectible for their quirky analog character and stunning design.

Limited but charming selection of preset rhythms.

Simple analog sound circuitry with a warm, nostalgic tone.

Rarely seen today, making it highly desirable for collectors of vintage drum machines.

Why You’ll Love It

While it won’t replace a modern drum computer in terms of versatility, the Checkmate delivers something unique:

A rare piece of music history that shaped the early years of electronic rhythm.

Unmatched aesthetics – the gold panel and oversized knobs look fantastic both in use and as a display piece.

Collector’s must-have – these machines are increasingly hard to find in good working order.

If you’re a vintage synth/drum machine enthusiast, this is a rare opportunity to own a serviced and working Checkmate drum machine. Perfect as a collector’s item, studio conversation piece, or source of authentic retro rhythms."

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MFB 501 Analog Drum Machine – 64 Presets, Rare Odd-Meter Rhythms, Works Perfectly

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via this Reverb listing

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Mode Machines Seq-12

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via this Reverb listing

"corners of the face plate are crushed. still able to be installed into a rack space without issues. Otherwise flawless. Comes with eu power supply and us adapter.

This is such an awesome sequencer. perfect solution for sequencing multiple channels of a drum synth or expander. Each channel has its own cc parameter lock style sequencing and pattern chaining capability. It’s a good balance of intuitive, quick, and deeply complex."

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Octave Electronics Cat SRM/II w/ Original Box & Manual

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via this eBay listing

"Cat SRM/II by Octave Electronics 1983
Vintage, monophonic analog synthesizer with three-octave keyboard.

Two analog VOC's for creating thick, rich sound.

VCO 1 with mixable saw, square, and triangle wave with sub-octave. Square wave has LFO-controlled pulse-width modulation.

VCO 2 with mixable square and triangle wave with sub-octave."

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Gorse Lathe - Drone demo

video upload by Synamodec

"GORSE LATHE is a handcrafted experimental synthesizer designed to explore the border between chaos and harmony. In this demo, we dive into its drone capabilities — sustained textures, evolving feedback, and harmonic movement that feels alive and unpredictable.

No sequences. No presets.
Just electricity, movement, and time.

🎧 Best experienced with headphones.

'Every drone is a landscape — you just have to listen long enough.'"

Also see Noise Sculpting with the Synamodec - Gorse Lathe.

Check with dealers on the right for price and availability.

Strymon SuperKar+ (Part 4) Chord Voice w/ Magneto, BitBox Micro, XPO, and ZPO

video upload by Rheyne

"The ‪@strymon‬ SuperKar+ Chord Voice through a Strymon Magneto. Percussion is from a BitBox Micro, bass is from a Make Noise XPO, and the background synth voice is from a Steady State Fate ZPO.

Loops are from Ableton Live, with a Korg SQ-64 acting as a MIDI to CV converter. Ableton's clock is randomized by CV Tools stepped-random LFOs. The Strymon Magneto is clocked by the kick drum trigger. Reverb is from Ableton Live. Recorded in one take.

SuperKar+ is a Eurorack voice module that uses Karplus-Strong synthesis to create the sound of plucked or bowed strings, struck or blown pipes or tubes, or a suite of other sounds."

Mini Analog Sequencer & Matrix VCF: Changing Filter Type Per Step & More #eurorack

video upload by AJH Synth Official and DreamsOfWires

"Using the new @DoepferMusikelektronikGmbH Mini Analog Sequencer to change filter modes on the Matrix VCF, whilst also providing a melody for the VCOs. Ideally, a separate sequencer would be used for each purpose, but just for fun I wanted to see what I could creating using the same sequencer CV to create both a melody, and change filter type on the Matrix. This is made much more viable using the CV MIX module, to adjust the range of CV to cover the modes I wanted to use - predominantly those at the bottom, including 4-pole low pass, band pass, all pass, and the combined 3-pole all pass & 1-pole low pass mode.

Stereo Panning per step also features towards the end (headphones recommended), using the Triple Cross module to pan the mono sequence between 2 outputs, which is sent to a stereo input on the Cosmic Pro. The Tap Tempo VC-LFO is providing sample & hold-style random stepped voltages, which go to the Triple Cross module, modulating the amount of stereo panning between left and right on each sequencer step. I didn't increase the panning amount to maximum, because the result was just too extreme for my delicate ears! It's a great effect though."

TTMC Sequencer Card , Syncussion SY-1 , Buchla Music Easel

video upload by Tokyo Tape Music Center

Pocket Scion / Plinky+ / Modular

video upload by Grain Blanc

"First session with the Pocket Scion from ‪@instruo‬ and Plinky+ from ‪@MakingSoundMachines‬ & ‪@bluespoonery‬ Plinky synth and Modular friends."