Sunday, October 19, 2025
Soma Laboratory Documentary | Voltage Labs
video upload by Voltage Labs
"SOMA Laboratory creates instruments that don’t just make sounds - they start a dialogue. From the Lyra-8 to the Pulsar-23, Vlad Kreimer’s philosophy of 'romantic engineering' challenges convention, inviting chaos, unpredictability, and a deeper human connection with machines."
Montage M8X after one year: Can I sell all my other synths now?
video upload by Floyd Steinberg
"I've owned a Montage M8X for a year. Here's a video of 'this is cool and this still needs some work' impressions, as they came to my mind.
HÄLP ZIS CHANNEL
https://www.patreon.com/floyd_steinberg
https://floydsteinberg.gumroad.com/
https://floydsteinberg.bandcamp.com/"
The video I used for making my main point is this one;"
Hazel's Epic Brass Pad - UDO Super 6
video upload by UDO Audio
Find more from Hazel here: https://www.hazelmills.com/
Electro-Harmonix Memory Man - Solid State Echo/ Chorus - Serviced w/Restoration & Original Box
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
Additional Analog U.S. Listings
"This set is in excellent condition and working 100%. It has just been professionally serviced and with some restoration. As you can see, it does include the original box. This is the Memory Man V3, EH-7310, and uses the Panasonic MN3005 BBD. It will be properly packaged when sold and will arrive in the condition as stated. Not sold as-is! Proof of the actual shipping cost will be provided if needed. Although this listing is marked as a US sale only, I will ship to most countries."
via this eBay listing
Additional Analog U.S. Listings
"This set is in excellent condition and working 100%. It has just been professionally serviced and with some restoration. As you can see, it does include the original box. This is the Memory Man V3, EH-7310, and uses the Panasonic MN3005 BBD. It will be properly packaged when sold and will arrive in the condition as stated. Not sold as-is! Proof of the actual shipping cost will be provided if needed. Although this listing is marked as a US sale only, I will ship to most countries."
Salamander Music Sytems Voice 400 s/n 14 not perfect
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
This appears to be the first one featured on the site. Pics of the inside below.
via the listing:
"SMS (Salamander Music Systems - sorry for the typo in the title) Voice 400 - Programmable analogue mono synth with 2 VCOs and analogue delay line. Seems to work all OK EXCEPT the modulation generator (LFO) is not working. Condition is average. Has USA plug on, but can be switched between 110v/240v on rear. Also see the next lot."
via this Vemia listing
Click the auction link on top when you get there for additional listings.
This appears to be the first one featured on the site. Pics of the inside below.
via the listing:
"SMS (Salamander Music Systems - sorry for the typo in the title) Voice 400 - Programmable analogue mono synth with 2 VCOs and analogue delay line. Seems to work all OK EXCEPT the modulation generator (LFO) is not working. Condition is average. Has USA plug on, but can be switched between 110v/240v on rear. Also see the next lot."
Yamaha CS30 SN 4145
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pic of the inside.
"Released in 1977, the Yamaha CS30 is the flagship of their CS Monophonic range. It is as close to a modular synthesiser that Yamaha ever made and its modulation and routing options are extensive.
This one plays and sounds great. The synthesiser responds to all the pots and sliders as it should and it's ready to use and create weird and wonderful noises and textures. However, to get it to 100 percent functionality the synth requires a service to fix a few issues. Neither the combined 1+2 audio jack nor headphone output work, though the individual 1 and 2 jacks are fine. The sequencer works when switched to Manual and steps through by pushing the red button. However, the 'Clock' function only works when the synth has been powered on for a while and has 'warmed-up'.
Cosmetically the synth is in pretty good shape with nothing broken or missing. There are lots of very small dots of blistered paint, some with a hint of surface rust. The most noticeable ones are at the top of the control panel but these have not increased in size or number over the past decade-or-so. They don't look too bad, in my opinion. Inside is clean and dry with no signs of damp. One of the C keys has a cigarette burn (WHY??!!!) which has melted the plastic slightly. However, all keys are secure and function correctly. The case has a few marks here and there, but overall it looks good.
The case was designed to make servicing very easy. The front control panel is hinged at the back and can be opened by removing just two screws from each side panel. This then reveals a very neat collection of boards and wiring.
The CS30 can be easily integrated into a modern MIDI studio setup. By using an appropriate converter you can interface various features of the synthesiser via its numerous control inputs and outputs:
Foot Controller (CV) for volume in.
Sequencer CV and Trigger (gate) out.
Key Voltage (pitch CV) in and out.
Trigger (gate) in and out.
External (audio to the filter) in.
It features two voltage controlled oscillators (VCOs), two voltage controlled filters (VCFs - both featuring low-pass, band-pass and high-pass options), two voltage controlled amplifiers (VCAs) and three envelope generators. It also sports a ring modulator and a voltage controlled low-frequency oscillator (LFO).
It is fairly unusual for a hard-wired synthesizer in that it features a variety of switches which allow the user to re-route the signal flow from the usual VCO-VCF-VCA convention. For example, VCO 1 can output a square wave through VCF 1 whilst also outputting a high-pass filtered sawtooth wave through VCO 2. Another example is that the envelope generators can be assigned to any of the VCO, VCF and VCA modules and can also be inverted. Because the LFO is voltage controlled, the oscillating speed can be governed by an envelope generator and different waveforms can be applied to the other modules all at the same time. The CS30 also features an external signal input for filtering other musical instruments and audio sources, which can also be used as a modulation source. It includes an onboard eight-step analogue sequencer."
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pic of the inside.
"Released in 1977, the Yamaha CS30 is the flagship of their CS Monophonic range. It is as close to a modular synthesiser that Yamaha ever made and its modulation and routing options are extensive.This one plays and sounds great. The synthesiser responds to all the pots and sliders as it should and it's ready to use and create weird and wonderful noises and textures. However, to get it to 100 percent functionality the synth requires a service to fix a few issues. Neither the combined 1+2 audio jack nor headphone output work, though the individual 1 and 2 jacks are fine. The sequencer works when switched to Manual and steps through by pushing the red button. However, the 'Clock' function only works when the synth has been powered on for a while and has 'warmed-up'.
Cosmetically the synth is in pretty good shape with nothing broken or missing. There are lots of very small dots of blistered paint, some with a hint of surface rust. The most noticeable ones are at the top of the control panel but these have not increased in size or number over the past decade-or-so. They don't look too bad, in my opinion. Inside is clean and dry with no signs of damp. One of the C keys has a cigarette burn (WHY??!!!) which has melted the plastic slightly. However, all keys are secure and function correctly. The case has a few marks here and there, but overall it looks good.
The case was designed to make servicing very easy. The front control panel is hinged at the back and can be opened by removing just two screws from each side panel. This then reveals a very neat collection of boards and wiring.
The CS30 can be easily integrated into a modern MIDI studio setup. By using an appropriate converter you can interface various features of the synthesiser via its numerous control inputs and outputs:
Foot Controller (CV) for volume in.
Sequencer CV and Trigger (gate) out.
Key Voltage (pitch CV) in and out.
Trigger (gate) in and out.
External (audio to the filter) in.
It features two voltage controlled oscillators (VCOs), two voltage controlled filters (VCFs - both featuring low-pass, band-pass and high-pass options), two voltage controlled amplifiers (VCAs) and three envelope generators. It also sports a ring modulator and a voltage controlled low-frequency oscillator (LFO).
It is fairly unusual for a hard-wired synthesizer in that it features a variety of switches which allow the user to re-route the signal flow from the usual VCO-VCF-VCA convention. For example, VCO 1 can output a square wave through VCF 1 whilst also outputting a high-pass filtered sawtooth wave through VCO 2. Another example is that the envelope generators can be assigned to any of the VCO, VCF and VCA modules and can also be inverted. Because the LFO is voltage controlled, the oscillating speed can be governed by an envelope generator and different waveforms can be applied to the other modules all at the same time. The CS30 also features an external signal input for filtering other musical instruments and audio sources, which can also be used as a modulation source. It includes an onboard eight-step analogue sequencer."
Original Black Oberheim TVS Two-Voice System
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"One of very many items from Calum Hunter's superb home studio - and probably the jewel in the crown. This is a rare black version of Tom Oberheim's classic original Two-Voice synth. Cosmetically it looks a bit tatty at first glance - but on closer inspection, the bad areas where the paint has come off in places are all just on the chassis surrounding the SEMs and sequencer. Oberheim's preparation of these areas was obviously not up to their usual standard. Those pieces are usually white, and they simply over-sprayed them without preparing the surface well enough. In contrast, look at the black section immediately above the keyboard, which is really good.
All the modules (the important bit) are actually in extremely good condition - and apart from the sequencer having four little knob caps missing, near mint.
It would be simple to respray the bad chassis bits if you wanted. The tolex, keys and case hardware are pretty good for their age. There is no lid. The mains socket has been replaced with a safer IEC one. Voltage (TBC) is UK /European.
It has been tested by Audiocircus and is sounding great."
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"One of very many items from Calum Hunter's superb home studio - and probably the jewel in the crown. This is a rare black version of Tom Oberheim's classic original Two-Voice synth. Cosmetically it looks a bit tatty at first glance - but on closer inspection, the bad areas where the paint has come off in places are all just on the chassis surrounding the SEMs and sequencer. Oberheim's preparation of these areas was obviously not up to their usual standard. Those pieces are usually white, and they simply over-sprayed them without preparing the surface well enough. In contrast, look at the black section immediately above the keyboard, which is really good.All the modules (the important bit) are actually in extremely good condition - and apart from the sequencer having four little knob caps missing, near mint.
It would be simple to respray the bad chassis bits if you wanted. The tolex, keys and case hardware are pretty good for their age. There is no lid. The mains socket has been replaced with a safer IEC one. Voltage (TBC) is UK /European.
It has been tested by Audiocircus and is sounding great."
PWM Malevolent Semi-Modular Analog Keyboard Synthesizer
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
Moog Source Analog Keyboard Synthesizer SN 2041
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
Korg SB-100 Synthe-Bass SN 750076
Note: links to listings are affiliate links for which the site may be compensated.
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."
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."
Rare Vintage KORG KEIO (?) CHECKMATE Drum Machine
Note: links to listings are affiliate links for which the site may be compensated.
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."
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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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
