MATRIXSYNTH: Search results for Ground Grown Circuits

Friday, January 23, 2026

SOMA Laboratory and The Midium announce PULSAR-23 1984 Edition



Press release follows:

SOMA LABORATORY AND THE MIDIUM® COLLABORATE ON LIMITED EDITION PULSAR-23

New circuits and custom aesthetic introduced, marking first SOMA partnership with US-based engineers STEVENSON RANCH, CALIFORNIA––23 JANUARY 2026––Local online family-run-and-operated synth shop and boutique, The Midium, collaborates with SOMA Laboratory to introduce the SOMA Laboratory PULSAR-23 1984 Edition. New bass drum and bass synth circuitry expand the current PULSAR-23 four-voice drum machine and synthesizer’s functionality, while a custom polished-steel chassis and red LED scheme accompany an all-black carrying case, red-white-and-black alligator clips, and typewritten certificate of authenticity.

“The SOMA Laboratory PULSAR-23 1984 Edition is a marriage of parallel ideas. While having aconversation with SOMA Laboratory US’s Kevin Flynn in early 2025, we forged the concept for a 1984-inspired aesthetic born from the times in which we live, as well as some well-known works of fiction we both enjoy,” says Cami Bitar, who owns and operates The Midium with their wife Erin Bitar and 4-year-old daughter Melody Nightingale Wednesday Bitar. “During that conversation, we decided that a polished-steel chassis and red LEDs would also give the PULSAR-23 1984 Edition an intensely industrial feel as seen in certain sci-fi movies of the 1980s. After its aesthetics were set, Kevin mentioned that he and Noah Jolly of Ground Grown Circuits had been developing prototypes for experimental boards for the PULSAR-23 synthesizer and drum machine. That’s precisely when the ‘1984 Edition’ looked like the perfect platform for their new circuitry. To complete the story and bring the ‘1984’ inspiration full circle, we saw that a stark black case and typewritten certificate of authenticity would round out the idea. Finally, having decided that we would work on this together, it was determined that The Midium and SOMA Laboratory would be the only authorized sellers of the PULSAR-23 1984 Edition.” Bitar adds that only 84 units will be made for the US market, according to SOMA Laboratory.

Kevin Flynn, who heads the SOMA Laboratory US Division, gets into the details. “The SOMA Laboratory PULSAR-23 1984 Edition marks the first time that the company has partnered with US-based engineers. Noah Jolly and I developed new circuit boards for the bass drum and bass synth modules onboard the PULSAR-23 in order to see how far we can push the PULSAR-23 platform.”

Flynn explains what makes the SOMA Laboratory PULSAR-23 1984 Edition’s sound and timbre unique.

“For instance, the bass drum on the PULSAR-23 1984 Edition introduces an oscillator design that produces an asymmetrically clipped triangle wave that can be driven to the point of becoming a square wave, which makes for a more aggressive and harder-hitting bass drum which is perfect for techno and other musical styles. The bass drum on the PULSAR-23 1984 Edition’s tuning range is now also wider than before, which also adds to its flexibility in use, and the “OMG” pin is now an AC-coupled FM input that enhances the bass drum’s sound design potential.” He ends by saying of the second modified module in the PULSAR-23 1984 Edition, the bass module, that it “now features a new filter inspired by the Polivoks, which is a classic analog synth made in the Soviet Union during the 1980s. That’s a key part of the ‘1984’ concept, and the bass module’s new filter has a similarly aggressive nature.”

The SOMA Laboratory PULSAR-23 1984 Edition is available now exclusively at TheMidium.com and EarwormLLC.com.

Tuesday, November 18, 2025

Melting Point Vactrol Filter


video upload by Ground Grown Circuits

"Short demo of a sequence running through the Melting Point vactrol filter. Now available on my Reverb page"



via this Reverb listing

"THIS IS A FULL DIY KIT

This kit includes everything required to build the Melting Point vactrol filter. This is a character filter that will add a lot of color to the sound.
There is a low-pass and hi-pass audio input, an audio output, 2 CV inputs and a variable level “Strike” CV input.

The feedback/resonance will begin self oscillating slightly past noon, and will continue to add more drive and color if you push it further.
Trim pot on the rear allows adjustment of CV response.

Includes a power cable and 4x M3 screws.

There is a qr code in the kit that will take you to a page with build instructions.

Please note the knobs included in the kit are different than the knobs in the finished module image."

Friday, September 05, 2025

Akai Rhythm Wolf Drum Machine with Mods

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Ground Grown Circuits

"Trying a different vid of the akai rhythm wolf with mods, now available on my reverb page."



via this Reverb listing

"Mods include:

Individual outs (pre fader)

Bass Filter CV input

Heavy modifications to the bass filter circuit

High pass filter option

Filter keyboard tracking

Heavy modifications to the Howl overdrive

Howl only affects bass instead of all instruments"

SN (21)A41411159704311

Monday, August 04, 2025

Rhythm Wolf with Mods


video upload by Ground Grown Circuits

"A demo of my Akai Rhythm Wolf with some modufications.
Changed filter and overdrive, added high pass mode, added keyboard cv to filter, made envelope amount to filter bi-polar, added individual outputs on front and filter CV input on rear panel."

Sunday, June 22, 2025

Korg KLM-711 Chorus

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Ground Grown Circuits



via this Reverb listing

"Effect pedal made from an authentic Korg KLM-711 Chorus board, as seen in the Poly-800 and DW-6000.

I added a few modifications that allow you to adjust the Wet/Dry Mix, LFO rate and LFO Amount.

The LFO will go into audio rate allowing for ring mod sounds.

The Amount will change the LFO shape, once you pass 2 o clock on the knob it will clip the triangle shape making it more of a square wave.

The footswitch is true-bypass and will send the input signal to both outputs when the effect is deactivated.

Needs a 9-15V DC tip-positive power adapter, not included."

Thursday, February 06, 2025

Casio MT-46 with mods


video upload by Ground Grown Circuits

"Demo of the mods I installed on this casiotone mt-46.
Pitch knobs for accompaniment and melody, drum trig i/o, and mutes for accompaniment section."

Wednesday, January 01, 2025

Casio SK-1 with mod

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Ground Grown Circuits

"This mod lets you use an on-board lfo to switch back and forth between the analog filters on the SK-1.
Available for sale on my Reverb page."



via this listing

"Mod Description:
With the switch up, everything functions as normal.
With the switch down, a square wave LFO is used to switch back and forth between the internal sound filters for the melody, creating a neat tremolo effect. LFO rate is set by the knob."

Tuesday, August 27, 2024

Brother Auto-Emillion GX -151 with Mods


video upload by Ground Grown Circuits

"Brother Auto-Emillion GX -151 aka Baldwin Discoverer DS-50 divide down organ with analog rhythm and casiotone style accompaniment.

Mods include rate knobs for several modulation oscillators, Bass output, Rhythm output, and Rhythm clock I/O"

Sunday, August 25, 2024

Modded Out Akai Timbre Wolf - The Dire Wolf


video upload by Ground Grown Circuits

"short demo of some of the mods I've done on my Timbre Wolf"

Sunday, July 07, 2024

Ground Grown Circuits Angelo Dual VCF


Saw Wave Demo video upload by Ground Grown Circuits

"Short demo of a digital Saw waveform through my Angelo Dual VCF design.
Shows first what a single filter sounds like, then the Mix output, then the B-A output, then both A and B outputs panned hard left and right respectively."

Friday, July 05, 2024

Casio MT-45 with Mods


video upload by Ground Grown Circuits

"Demonstration of the modifications I made to this Casiotone MT-45.
Trigger inputs and outputs for the drums, clock out derived from the arpeggio, mutes, and a sub for the bass."

Thursday, June 27, 2024

First sounds from WS-2X


video upload by Ground Grown Circuits

"WS-2X Professional Werkstattion
Built from 2 Moog Werkstatts
Sound direct from headphones port, no external effects"

Saturday, June 15, 2024

Casio RZ-1 With Mods


video upload by Ground Grown Circuits

"Sample tone knobs moved to front panel, variable clocks added to the percussion generator ICs, and upgraded ROM chips and firmware.
All stock sounds from upgraded ROM at end on video."

Thursday, February 29, 2024

Ground Grown Circuits Moog Minifooger MF Chorus Super Mod


video upload by Ground Grown Circuits



via this auction

"This is a Moog MF Chorus modded and rehoused in light blue hammond enclosure.

Description of mods:

Top left is the Stereo/Mono output switch.

Mix switch replaced with knob to allow finer control of mix settings.

Feedback expanded to allow self oscillation.

Three lower switches, top to bottom: LFO rate switch, LFO shape switch with center off position, and Time range switch to allow for more Flange like sounds.

Required tip negative 9V power supply, not included."

Ground Grown Circuits Custom Korg Poly-800 Filter and Chorus Mods Demo

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Ground Grown Circuits



via this auction

"This thing is great for dreamy evolving pads, drunk sounding horns, lofi surfing, and 80’s car chases.

The filter is modded to allow free playable control over cutoff and resonance, with a 2 pole/ 4 pole switch installed for more variety.
The chorus has been modded to allow adjustment of the rate, going into audio range for ringmod-like effects, adjustment of depth, and a true mix knob allowing for control between fully dry and fully wet.

There’s an external input, so you can run some audio signals in and override the noise (ext input level follows noise/filter envelope).

The internal battery has been replaced with a battery clip for no-solder battery swaps and a brand new battery has been installed.

All the tact switches have been replaced, so no annoying switch bounces while trying to program a sound.

The instrument is painted to match the green lettering in the programmer menu."

Friday, March 29, 2019

TINRS Fenix IV Update


An update via This Is Not Rocket Science:

"Fenix IV assembling parts
Six more weeks until Superbooth…

We are working hard on the first Fenix IV prototype and alternate between 'this is madness' and 'this is awesome'. Probably both are true.

All the parts has been tried and tested in Experiment Boards 1, 2 and 3. Everything works and we are happy with our sounds and effects. Now these parts have to make a mythical beast. The CPU plug-in boards and filter voice boards are in the mail. Chips are being ordered. Power, midi and plug board are in-house and partially assembled. The tiny headphone board is ready. Our interconnect board – connecting the modules to the jacks and replaces the wiring harness – will be ordered together with big board. Flying in from all over the world, all the pieces are coming together.

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