via this listing
Additional Perfect Circuit listings
Friday, March 13, 2026
Suiko ST-40 Koto Synthesizer SN 403971 w/ Blue Case
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
See dealers on the right for pricing and availability on gear.
LABELS/MORE: Auctions, Perfect Circuit, SUIKO
LABELS/MORE: Auctions, Perfect Circuit, SUIKO
Nord Rack X2 Virtual Analog 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
See dealers on the right for pricing and availability on gear.
LABELS/MORE: Auctions, Clavia, Perfect Circuit
LABELS/MORE: Auctions, Clavia, Perfect Circuit
Moog Opus 3 — "New Old Stock" Sliders, Switches, Controls, Control Caps & Knobs SN 5828
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
"The Moog Opus 3 is a vintage polyphonic synth that combines string, organ and brass sounds in a four-octave keyboard, along with flexible controls for shaping each sound.
One of the coolest things about the Opus 3 is that it has a classic Moog four-pole filter that the brass and organ can be run through. The filter has the sound Moogs are famous four, and it can be run into self-oscillation.
The synth also features a three-phase chorus effect that uses the famed Reticon bucket brigade chips, as well as stereo and mono outputs.
Here are details about the unit for sale:
The old, deteriorating foam that sat below the control panel has been removed from this one, so you don’t have to worry about it.
All of the sliders, switches and rotary controls — except for the master volume — were changed out for New Old Stock replacements. All the slider caps and control knobs are New Old Stock as well. Everything works smoothly, with no noise or issues.
The master volume has very minor crackle at the top end of its range while it’s being moved. It is otherwise noise-free during normal operation. I would have had it changed out but it wasn’t possible to source an original replacement.
One of the three original Reticon chips in the chorus effect was replaced when an original failed. All three are working, and the chorus sounds great.
The original red LED in the Modulation section was swapped out for a new bright blue LED.
I wasn’t able to test the sustain jack on the unit’s front panel. Moog chose an unusual size jack here— it’s slightly smaller than a 1/4-inch input. It would be easy to swap it out with a proper 1/4-inch jack if you choose to do so.
The physical condition is very good. Note the scratches to the wood and some minor marks on the faceplate.
All of the notes sound as they should, and all controls and functions work as they should.
HELPFUL NOTES
Although its functions are basic, you’ll need to understand the signal routing in the Opus 3. These are spelled out in the owner's manual (which is available online), but knowing the following will help you get your head around it.
For example, the chorus effect operates on the strings and organ, not on the brass. This is by design and is noted by an arrow on the control panel.
The Moog four-pole VCF can be used on the organ and brass, not the strings. Again, this is by design and is noted by an arrow on the control panel.
Frequency Modulation works on all sounds, but VCF modulation only works on the organ and brass because these are the two sounds that can be run through the VCF (see the point immediately above). Again, this is by design.
The length of chorus delay is set by using the delay fader in the Modulation section. This too is by design.
Two other noteworthy points:
• The pitch wheel has a firm detent (the point at which it sits at pitch). Other owners have noted the same thing about their units in online forums. It’s not difficult to work, but it’s firmer than on other synths I’ve owned.
• All of the electronics, aside from those mentioned above, are original and working fine. Electrical components can fail or become damaged with time and/or misuse. Always be sure you are connected to proper voltage, and note that ground loops can introduce hum."
via this eBay listing
"The Moog Opus 3 is a vintage polyphonic synth that combines string, organ and brass sounds in a four-octave keyboard, along with flexible controls for shaping each sound.
One of the coolest things about the Opus 3 is that it has a classic Moog four-pole filter that the brass and organ can be run through. The filter has the sound Moogs are famous four, and it can be run into self-oscillation. The synth also features a three-phase chorus effect that uses the famed Reticon bucket brigade chips, as well as stereo and mono outputs.
Here are details about the unit for sale:
The old, deteriorating foam that sat below the control panel has been removed from this one, so you don’t have to worry about it.
All of the sliders, switches and rotary controls — except for the master volume — were changed out for New Old Stock replacements. All the slider caps and control knobs are New Old Stock as well. Everything works smoothly, with no noise or issues.
The master volume has very minor crackle at the top end of its range while it’s being moved. It is otherwise noise-free during normal operation. I would have had it changed out but it wasn’t possible to source an original replacement.
One of the three original Reticon chips in the chorus effect was replaced when an original failed. All three are working, and the chorus sounds great.
The original red LED in the Modulation section was swapped out for a new bright blue LED.
I wasn’t able to test the sustain jack on the unit’s front panel. Moog chose an unusual size jack here— it’s slightly smaller than a 1/4-inch input. It would be easy to swap it out with a proper 1/4-inch jack if you choose to do so.
The physical condition is very good. Note the scratches to the wood and some minor marks on the faceplate.
All of the notes sound as they should, and all controls and functions work as they should.
HELPFUL NOTES
Although its functions are basic, you’ll need to understand the signal routing in the Opus 3. These are spelled out in the owner's manual (which is available online), but knowing the following will help you get your head around it.
For example, the chorus effect operates on the strings and organ, not on the brass. This is by design and is noted by an arrow on the control panel.
The Moog four-pole VCF can be used on the organ and brass, not the strings. Again, this is by design and is noted by an arrow on the control panel.
Frequency Modulation works on all sounds, but VCF modulation only works on the organ and brass because these are the two sounds that can be run through the VCF (see the point immediately above). Again, this is by design.
The length of chorus delay is set by using the delay fader in the Modulation section. This too is by design.
Two other noteworthy points:
• The pitch wheel has a firm detent (the point at which it sits at pitch). Other owners have noted the same thing about their units in online forums. It’s not difficult to work, but it’s firmer than on other synths I’ve owned.
• All of the electronics, aside from those mentioned above, are original and working fine. Electrical components can fail or become damaged with time and/or misuse. Always be sure you are connected to proper voltage, and note that ground loops can introduce hum."
Moog Memorymoog SN 2409
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
"The Memorymoog is like having six Minimoogs stacked in one! Features include VCO syncing, sample and hold, and separate filters for each voice! It also has a Unison mode for a fat 18 oscillator monophonic bass and lead sound."
via this eBay listing
"The Memorymoog is like having six Minimoogs stacked in one! Features include VCO syncing, sample and hold, and separate filters for each voice! It also has a Unison mode for a fat 18 oscillator monophonic bass and lead sound."
Befaco " Game Console" Chiptune System Demo
video upload by Stazma and Befacosynth
"Today we are going to check out a small mini system I put together, with only Befaco modules, that I like the call the 'Game Console Chiptune System'."
00:00 Intro
02:43 Module Overview
03:47 Level 1: Patch it solo
11:03 Level 2: Patch a synth voice
18:44 Level 3: Breakbeat Torture
22:59 Level 4: Arcade Melody
29:43 Side Quest: Rampage as a "sample & hold"
32:02 Final level: Just have fun!
36:50 End talk
See dealers on the right for pricing and availability on gear.
LABELS/MORE: Befaco, eurorack, MATRIXSYNTH Members
LABELS/MORE: Befaco, eurorack, MATRIXSYNTH Members
E minor JAM in 5 *Yamaha Reface CS & Roland D-05 Boutique* Ambient Vibes
video upload by Soundscapes of Johann🎶
"Cozy vibes on a stormy day using the SOFT FOCUS patch by Legowelt on the D-05 coupled with the looper on the CS."
Nightverb 1.02 update
video upload by Erica Synths
"This update adds a compressor and a noise gate, making it possible to create a true gated‑reverb effect. Famous from the 80s productions, gated reverb is an audio processing technique that combines reverb with a noise gate to create punchy sounds while keeping the mix clean.
More info: https://www.ericasynths.lv/news/post/..."
See dealers on the right for pricing and availability on gear.
LABELS/MORE: Erica Synths, New Updates, News
LABELS/MORE: Erica Synths, New Updates, News
Korg multi/poly: Cosmic Circuit - Part 02
video upload by App Sound (by Matt Sour)
Part 1 here
"Korg multi/poly: Cosmic Circuit - Walk through: Performance 33-64
A sound library by Christian Gritzner & Matthias Sauer.
Purchase: https://www.app-sound.com/korg-multi-...
0:00 Notch Gladiator
0:29 Void Keys
0:48 Back in Time
1:06 Mirror Sky
1:27 Frozen Transmission
1:57 Stellar
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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
