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MOTM Modular Synthesizer

“Hi I have my last rack of MOTM 5U modules that I would prefer to sell as a package deal.

The basic MOTM rails are included as well as the following modules…

Synthcube 266 Source Of Uncertainty. Built by Roman.

Catgirl Dual ASR

MFOS Dual Quantizers

Happy Nerding Super Sawtor

Bridechamber MOTM 510 Wavewarper

Bridechamber MOTM 410 Triple Resonant Filter

The listing is for rack and modules only. You will have to supply your own 4 pin power cables and power supply.” Click here to visit listing on eBay

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Modular Synthesizer Dot Com Format

“For sale is a mostly homemade modular synthesizer in the Synthesizers.com format, consisting of the following modules in a 22-unit cabinet:

1 – Synthesizers.com Q104 MIDI Interface

2 – Yusynth VCO (matched BC547 version)

3 – Synthesizers.com Q106 Oscillator

4 – Yusynth Sample & Hold / Noise Source

5 – Yusynth ADSR (new version)

6 – Yusynth ADSR (new version)

7 – Yusynth Dual Gated Slew

8 – Yusynth Clock Divider

9 – Multiples (three groups of four, with a switch to join two groups)

10 – Yusynth VC-LFO 2

11 – Yusynth Ring Modulator (old version with no surface-mount parts)

12 – Yusynth Minimoog Filter

13 – Synthesizers.com Q107 State Variable Filter

14 – Yusynth Haible Wavefolder

15 – Yusynth VCA (DC version)

16 – Yusynth VCA (DC version)

17 – Yusynth AC-DC Mixer

Also included: an IEC power cord, a MIDI cable, 13 assorted patch cords, one blank 1-unit panel (mounted on back), original paper documentation for the “DotCom” modules, and my original plans.

I planned this instrument in late 2012 when I was in high school, choosing the modules mainly for playing melodies and bass-lines similar to what I heard in 1970s prog-rock and C64 chiptunes. Construction finished in late 2013 except the LFO module, which was built in mid-2016. This was my first major electronic build, during which I learned how to etch, drill, and design circuit boards, and to apply lettering to panels. I hadn’t yet learned to design my own circuits, so all designs are from Yusynth except the power supply, which is from Ken Stone (with my own circuit board design). Here are some facts about the sections that I built:

– All modules started as blank Synthesizers.com panels except the power module on the back, which was made from sheet aluminum.

– Lettering was applied using the “DecalProFX” method, which involves printing a toner image, coating it with colored foil (in this case, white), and then transferring it to the panel. Small defects were corrected with a Sharpie paint pen. All lettering has been sealed over with matte clear-coat.

– Circuit boards are all single-sided and through-hole, etched using the toner transfer method, and tinned with MG Liquid Tin.

– All chips are socketed for easy replacement, though none have needed it so far.

– Cabinet was made from particleboard shelves with vinyl woodgrain. Its corners use metal bracket joints, and the modules mount to hardwood strips with decorative black wood screws. I can provide additional screws if desired. On the bottom are 8 adhesive feet.

The workmanship is quite good, if I may say so, but it shows some evidence of being mostly homemade – see pictures. It has been kept very clean in my basement studio for its whole existence (and I just cleaned the jacks after noticing they are a bit dusty in the photos), so it still looks and functions like new. I calibrated it for the second time ever in March 2025; I had not felt the need to make any adjustments between when it was built and now.” Click here to visit listing on eBay

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PAiA 9308 FatMan

“I have decided to sell my PAiA FatMan kit. I purchased this for a studio project but ended up not needing it. This is a complete kit as sold by PAiA.

I am including for free the rackmount face plate, so this is actually the complete Panel Bundle, but the panel has been kicked around in storage and has some paint damage (see photo). With this kit you can build the synth out as a rackmount, or you can purchase any of the other finishing options from the PAiA website. A chassis is not included, nor does PAiA sell a rackmount chassis. I believe they do sell a desktop chassis and faceplate. If you really do not want the rackmount faceplate I can exclude that from the package and issue a partial refund on shipping, since that piece is having a significant say on the size of the package.

Also included are two rectifier diodes and a 56K resistor I received as replacement parts from PAiA, unsolicited. I think they had a bad batch for those, realized it, then sent out the replacements. See photo for details.” Click here to visit listing on eBay

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Mannequins Three Sisters

“RARE – only 500 of these were ever made. 100% functional, in excellent cosmetic condition, and it sounds great! There are some minor scratches on the top & bottom of the unit, but the faceplate is super-clean (please examine the photos closely). It has lived in a smoke-free studio and has been well taken care of. Power adapter & user manual is included. “ Click here to visit listing on eBay

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PAiA MIDI 2 CV

“This unit was hand-built by the legendary John Blacet. I have not plugged it in for years but I have no reason to believe it doesn’t work as intended. Unfortunately, I can’t test it (sorry, I hate to list things that I can’t test). Therefore, sold as-is” Click here to visit listing on eBay

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Flame Tame Machine

“Flame Tame Machine Eurorack Synthesizer Module Quantizer Beatlooper used condition some rack rash all is working comes with module and power cable only. ” Click here to visit listing on eBay

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Buchla Music Easel

“Retro Gear Shop is an authorized Buchla dealer.
Brand New with full Warranty.” Click here to visit listing on eBay

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Malekko Varigate

“Selling my Varigate 4+ Eurorack Modular sequencer. It’s fun to use, but I have other sequencers and never use this one anymore.” Click here to visit listing on eBay

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4ms Shuffling Clock Multiplier and S.C.M. Breakout

“I’m selling my 4ms Shuffling Clock Multiplier and SCM Breakout as a pair. Both modules are in excellent condition and work perfectly together to expand your clocking and timing capabilities.

no original box. rack rash .” Click here to visit listing on eBay

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Malekko Oscillator II

“Malekko Richter Oscillator ii
Used with slight rack rash but in working condition.
One of the cleanest sines in the biz
and phase modulated outputs!

No longer in production” Click here to visit listing on eBay

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Doepfer A-100 Modular Synthesizer Case

“Part Number: N13-5938-IEC
Model: Monster Base Case
Color: Black
Condition: New/Open Box–all included items shown in photos and untested unless otherwise noted; distressed packaging; labels removed from box exterior; comes in generic box; see photos” Click here to visit listing on eBay

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The Harvestman Malgorithm Mk1

“Great shape and fully functional. The panel is the original etched panel from The Harvestman. I don’t know how many of these were made before changing to the printed regular production MK1. I bought this from the modwiggler forum many years ago. I can’t remember if I bought it directly from harvestman or from someone else. An exceptionally rare piece of The Harvestman / IME history. Comes with ribbon cable and screws ” Click here to visit listing on eBay

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Metasonix & Music Thing Modular Synth

“You are purchasing this previosuly owned and used Metasonix & Music Thing Modular Analog Modular System that came from a working studio and is in good physical and workign condition. In this sytem there is as follows, Music Thing Modular (2) Pulses, (6) Vactrol Mix, (2) Turing Machine and (6) Volts. Metasonix (2) RK3 Ringer/Shaper, (3) RK4 BP Filter/Osc, (2) RK6 Resonant Lowpass Filter, (1) RK5 Dual Low Pass Gate, (2) RK2 Xs-VAC, (2) RK7 Thyratron VCO. This system comes as shown in pictures. ” Click here to visit listing on eBay

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PAiA Gnome

“Here is a vintage PAiA Gnome analog synth from the 1970s. These were sold as kits and have a bit of a cult following. This one has been serviced recently with new capacitors, a new Trigger button, new LM3900 IC, and some general cleaning. I am including a binder with a full set of printed user and assembly manuals plus the original articles from Radio Electronics magazine.

The Gnome is in good working condition and makes all sorts of cool sounds and noises. These run on two 9v batteries (not included) and have Audio Out and Trigger Out jacks. There is a conductive plastic strip with a stylus for pitch control. The strip is in OK condition and has been cleaned, but it is not perfect. Overall this is a unique sounding little synth that sounds great on it’s own, through pedals, or interfaced with a larger system. Sold as-is.” Click here to visit listing on eBay

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Intellijel Quadra & Expander Project Machine

“Up for sale is my beloved Intellijel Quadra 4-channel envelope/LFO analog Eurorack synthesizer module, and its associated expansion module.

Unfortunately, there are several functions broken:
– Putting the Envelope #4 into LFO mode does nothing, so Envelope #4 only functions as an AR and AHR envelope. The other 3 work great.
– The EOC 4 output does not function, so you can’t get a trigger when Envelope #4 finishes running. The other 3 work great.
– The Quad 3+4 switch has no effect, so Envelopes #3 & #4 cannot be put into quadrature oscillation. Quad 1+2 still works great.

I believe this happened because I did not correctly attach the expander to the main unit one time :'(. I’ve used it for approximately 7 years since then, so I don’t expect any further failures as a result of this mistake. I will ship it to you with the expander already attached (carefully packed) to spare you from the same humiliation!

These functions are broken even with the expander removed. Cosmetically, it is in great condition (with the usual rack rash on the panel screw holes).

Includes 17 jumpers (16 are required on the back of the main unit when the expander is not attached, and 1 extra), and 8 M3 standard Eurorack screws. Comes from a smoke-free and pet-free household.” Click here to visit listing on eBay

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Wiard Model GR-1212A Boogie Filter

“Wiard Model GR-1212A Boogie Filter. Vactrol filter / low pass gate. Rare, long out of production frac rack VCF. Very good condition with some rack rash. This module was modified by the previous owner with the “C1” or “Matrix 12″ mod that allows multiple filter modes/types when using a multi-input mixer. The mod was very professionally done, and is easily reversible if you wanted to (but honestly, I have always found it to be really useful). Tested, working exactly as it should” Click here to visit listing on eBay

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Synthesis Technology E370 Quad Morphing VCO

“Here it is…rarely for sale. The mighty E370! 4x VCO in one massive, highly-tweakable package. Uses a DSP chip to get sounds in 96kHz – can you believe that?

I used this for wave shaping but have not used it much lately. It’s still on original factory firmware. These were expensive new and are impossible to find for sale. This needs a good home and it needs to be in regular use! Is that you?” Click here to visit listing on eBay

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PAiA 4700 Modular Synthesizer

“This PAiA 4700 Modular Synthesizer is a rare vintage unit that powers on as-is. It is a great addition to any musician or producer’s collection. With its unique sound and versatile capabilities, this unit is perfect for creating complex and organic sounds that cannot be achieved through digital means. This synthesizer is ideal for those who are looking for a specific sound or want to experiment with the possibilities of modular synthesizers.” Click here to visit listing on eBay

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Make Noise Pressure Points

“The Pressure Points module is a controller, Touching the gold plated copper wires (aka Touch Plates), you become part of the circuit, generating a gate signal (Gate OUT), a control signal proportional to the amount of pressure applied (Press OUT) and the 3 Tuned Voltages ” Click here to visit listing on eBay

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Make Noise MMG

“Items included in this listing:

Make Noise MMG module
power cable
original box” Click here to visit listing on eBay

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WMD Crucible

“I’m selling this WMD Crucible Hi-Hat & Cymbal Synthesizer Eurorack Module in Very Good Condition.

Please excuse the flecks of dust in the photos.

Will be supplied with the original box and sent fully insured by Royal Mail Special Delivery.” Click here to visit listing on eBay

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Eurorack Modular

“This is my modular setup that I used for a while, I just haven’t been using modular as much recently.

Includes: Intellijel Dixie II+, Intellijel uVCA, Lumanoise 808 Cymbal Drone Generator, EMW Sequential Voltage 8, Doepfer A-138 (Exponential) Mixer, Ladik C-030, VoicAs 2CVLFO, Tiptop Audio Happy ending case (with its power supply) and a lot of patch cables.

Everything works and is in great shape except the Lumanoise 808 drone module, which has some rack rash (and cracks in the panel in the top corners, it’s made of brittle wood) but other than its cosmetic damage, the module works flawlessly.” Click here to visit listing on eBay

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Make Noise Maths

“Make Noise – Maths Module – 2012
Function Generator / Analog Computer
Eurorack Modular Synth Gear

Excellent condition. Smoke free environment.
Comes with ribbon connector.” Click here to visit listing on eBay

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Buchla Modular Synthesizer

“Buchla system with the following modules and accessories.

208c Module, 208c MIDI Expansion, 2 Universal Midi I/O + mini jack to midi cable, 223e + Passive Frame + 3 foot 223e ribbon cable with breakout, 207e, 201e-12 with SKB Case, 4 10″ Orange Cables, 8 20″ Green Cables, 4 Shortning Bars, 3 24″ Green Audio TiniCables.”
Click here to visit listing on eBay

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Make Noise QMMG

“Bought at the in store event. I already had an original one so I am selling this one and donating the profits from this to Samaritans Purse to help the victims in Asheville. Comes with original bag from in store event, module, stickers, box and ribbon power cable” Click here to visit listing on eBay