KOSMOS – A Generative MIDI Sequencer for RP2040 (DIY Project)

You might recall KOSMOS from previous posts here. Plantssystem aka GreyScale wrote in to let us know the source code has been released. Details and link to the github repository follow.

"KOSMOS is a compact, self‑contained generative MIDI sequencer built on the Raspberry Pi Pico (RP2040).

Power it on, and it immediately begins producing evolving melodic patterns — no DAW, no clock source, no setup.

The project combines a Euclidean rhythm engine, Japanese‑mode melodic generation (Hirajoshi / Insen / Miyakobushi),
and a 240×240 LCD UI for real‑time visualization of steps, probabilities, and phrase movement.

A small instrument with a surprisingly expressive voice.

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CLICK FOR MORE »

GreyScale-LiveZen

video upload by plantssystem

"GreyScale presents 'LiveZen' — a meditative performance shaped around the Duos.
Built with the Poly‑Sequencer, Prophet‑5, CS‑10, and the spatial processing of the VS‑1880 (RSS), this piece blends improvisational noise textures from Duos with the delicate tones of the Prophet‑5 and CS‑10.
A quiet, breathing soundscape that drifts between motion and stillness.

#livezen #duos #polysequencer #prophet5 #cs10 #ambient #rss #vs1880 #greyscale #noise"

GreyScale-CS10Chaos #greyscale #cs10 #duos #prophet5 #electronicmusic #synthesizer #link

video upload by plantssystem

GreyScale-KOSMOS #greyscale #kosmos #generative #sequencer

video upload by plantssystem

"KOSMOS – a generative sequencer built on GreyScale – controlling the legendary Prophet‑5.
This short clip captures KOSMOS creating evolving melodic patterns in real time, while the Prophet‑5 responds with its unmistakable analog tone.
A small brain driving a giant synth.

#generativemusic #sequencer #prophet5 #raspberrypi #diyinstrument #euclideanrhythm
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GreyScale ベースのジェネレーティブシーケンサー「KOSMOS」が Prophet‑5 をコントロール。
KOSMOS がリアルタイムで生成するフレーズに、Prophet‑5 がアナログの深い響きで応える瞬間を収めました。
小さな装置が大きなシンセを動かす、その“生命感”を感じてください。"

GreyScale-KOSMOS #raspberrypi #pico #rp2040 #midi #sequencer #algorithmic #generative #kosmos

video upload by plantssystem

Follow-up to this post.

"KOSMOS – A Compact Generative Sequencer Driving the Prophet‑5

This short clip features KOSMOS, my standalone generative MIDI sequencer, controlling a Sequential Prophet‑5. KOSMOS creates evolving melodic patterns and rhythmic variations in real time, while the Prophet‑5 provides its unmistakable analog warmth and depth.

The performance is completely autonomous — no DAW, no external processing — just KOSMOS generating the sequence and the Prophet‑5 responding with its classic tone.
It’s a small glimpse into how KOSMOS interacts with hardware synths and how expressive the pairing can be."

GreyScale – A Standalone MIDI Sequencer KOSMOS Powered by Raspberry Pi Pico (RP2040)

This one is in via GreyScale aka plantssystem whose videos you have likely seen on the site.

"GreyScale is a compact, self‑contained MIDI sequencer built entirely around the Raspberry Pi Pico (RP2040).

Its minimal hardware footprint hides a surprisingly deep generative engine, combining Euclidean rhythm generation, step sequencing, probability control, and evolving melodic behavior.

The clean GreyScale UI provides immediate visual feedback — step activity, Euclid parameters, probability states — all rendered on a crisp LCD. A joystick and four dedicated buttons offer fast, tactile control, keeping the workflow musical and instrument‑like rather than menu‑driven.

GreyScale runs completely standalone with standard MIDI output, making it an ideal partner for hardware synths, desktop modules, or DAW setups.

Designed for spontaneity and long‑form generative performance, it encourages exploration and rewards experimentation. A small instrument with a refined feel, GreyScale blends DIY charm with a polished, modern sequencing experience."

Update: demo here.

CLICK FOR MORE »

Repair Report: BOSS DR-55 Dr. Rhythm Foot Switch Restoration

This one is in via supporting member GreyScale aka plantssystem who had the following to say:

Restoring a Classic: BOSS DR-55 Foot Switch Jack Replacement

"The BOSS DR-55 is a staple of early 80s minimal wave and synth-pop, but its plastic jacks are often a point of failure after four decades."

The Issue

The unit arrived with a missing original foot switch jack, rendering remote Start/Stop operations impossible. To ensure a rugged and reliable fix, I decided to upgrade the component rather than searching for a rare vintage plastic replacement.

The Solution: Switchcraft 12A

I opted for a Switchcraft 12A 1/4" Mono Jack (Shorting/Tip-Shunt). This is a classic choice for vintage gear due to its high-quality metal construction and reliability.

* Fit: The Switchcraft 12A fits the DR-55 chassis, though it requires careful grounding to the metal frame/PCB common.

* Wiring: Wired specifically to handle the DR-55's Start/Stop trigger logic.

Results

The repair was a total success. The unit now responds perfectly to a standard momentary foot switch.

* Start: Functional.

* Stop: Functional.

* Reliability: The metal Switchcraft jack provides a much more secure connection than the original plastic housing.

This DR-55 is now back in the studio, ready for another 40 years of 16-step sequences.

CLICK FOR MORE »

GreyScale-Freeze #greyscale #freeze #prophet5 #duos #polysequencer #vs1880 #rss

video upload by plantssystem

"‪@plantssystem-ufo‬
A three-dimensional acoustic specimen frozen in the freezing air.
This work combines the layered sequences of the Prophet-5 and Poly-Sequencer with the chaotic textures of the Duos. These were mastered using the legendary 3D sound processor, Roland RSS (Roland Sound Space).
A three-dimensional sound image unfolds to the left and right, and front and back.
Noise and melodies that would normally be heard right next to your ears are 'frozen' in a specific space, creating the illusion that they are floating."

GreyScale-Ceramo | GreyScale - Phase1

video upload by plantssystem

"For this release, the unpredictable chaotic noise generated by Hikari Instruments Duos has been thoroughly sampled and deconstructed using the glitch processor VST Utsbox.
The raw, untamed electrical signals from the Duos are precisely fragmented by the Utsbox, transforming them into hard rhythms and textures, recording the process. Enjoy a thrilling sonic experience where the randomness of analog collide with the sharpness of glitch audio."

GreyScale - Phase1

video uploads by plantssystem

"GreyScaleによる連続リリース・プロジェクト「Phase1」。
​毎月、特定の機材の組み合わせによる実験的なアプローチで、アナログシンセサイザーの可能性を追求したトラックを公開していきます。 ​Prophet-5、Poly-Sequencer、Duos、CS-10……。
回路から放たれる剥き出しの電気信号と、ミニマリズムが交差する音響記録。"

Googlish:

"GreyScale's ongoing release project, 'Phase 1'.
Each month, we will release tracks that explore the possibilities of analog synthesizers through experimental approaches using specific combinations of equipment.
Prophet-5, Poly-Sequencer, Duos, CS-10...
A sonic record where raw electrical signals emanating from the circuits intersect with minimalism."

GreyScale-DeadZone #greyscale #deadzone #duos #cs10

video upload by plantssystem

"This work uses a runaway noise generator from Hikari Instruments / Duos as the main source. This extreme signal was passed through the external input of the legendary 1970s Yamaha CS-10, and then thoroughly deconstructed and reconstructed using filter modulation.

The unpredictable chaos of the Duos and the sharp yet sticky analog filter of the CS-10 resonate with each other, creating a dry, tense acoustic space reminiscent of the 'Dead Zone' suggested by the title.
The critical point of electricity. Listen to the texture."

GreyScale-越百 #greyscale #越百 #cosmo #prophet5 #duos #polysequencer

video upload by plantssystem

"The high-density noise textures generated by the Duos and the sharp resonance sweeps of the Prophet-5. An experimental sonic construction where two analog signals intersect.
In this work, the Poly-Sequencer is placed at the core of control, creating multi-layered sequences. The hard sound of the Prophet-5, with its filter narrowed to its limit, cuts through the space against the constantly changing noise particles in the background.
The saturation of the analog circuitry and the stoic dynamism created by the sequence.
A track that explores the depths of sound."

"越百 is called Cosmo.

The photo shows Duos Self-Feedback."

"Cosmo was created using Roland RSS."

GreyScale-不動 #greyscale #不動 #prophet5 #duos #polysequencer

video upload by plantssystem

‪ "An unwavering pulse, engraved stillness.
Following on from the previous work, '不動' this is a minimalist, experimental sound creation constructed solely using the Prophet-5 and Duos.
Organic sequences intricately intertwine around a four-on-the-floor kick drum. As the name 'Unmoving' suggests, it depicts the contrast between an unwavering core of strength and the constantly shifting textures around it. Experience the collision of the pinnacle of minimalism and the unpredictable energy of analog circuitry."

GreyScale-紫波 #greyscale #紫波 #prophet5 #duos #polysequencer

video upload by plantssystem

"‪@plantssystem-ufo‬
GreyScale New Single '紫波'
A deep purple scene melting into silence. This new release, '紫波,' features the rich overtones of the legendary analog synthesizer Prophet-5 and the chaotic textures of the Duos. Enjoy a rich sonic experience where the warmth of analog meets the unpredictable noise."

PlantsSystem - Official Short Playlist 3

video uploads by plantssystem

Playlist:

1. PlantsSystem-ShelteringSky #ryuichisakamoto #covers #prophet5 #plantssystem #shelteringsky
2. PlantsSystem-DelikRealtime #plantssystem #livemusic #prophet5 #synth #techno
3. PlantsSystem-RedSkarf #plantssystem #prophet5 #electronicmusic #synth #techno
4. PlantsSystem-ChaosSync #plantssystem #prophet5 #duos #electronicmusic #synthesizer #techno
5. PlantsSystem-QuantumCircuits #plantssystem #electronicmusic #synth #prophet5 #techno #quantum
6. PlantsSystem-MindCubic #plantssystem #electronicmusic #synth #prophet5 #techno #ipad #polysequencer
7. PlantsSystem-Ignition #plantssystem #electronicmusic #synth #prophet5 #techno #ipad #polysequencer
8. PlantsSystem-November #plantssystem #electronicmusic #synth #prophet5 #ipad #polysequencer #techno
9. PlantsSystem-Vaiolation #akiramitake #reedit #plantssystem #mpc2000 #prophet5 #sampling

PlantsSystem-S&H

video upload by plantssystem

"Their latest track, 'S&H' is inspired by the Sample & Hold (S&H) function of analog synthesizers. It 'holds' a continuous signal at set intervals, depicting changes like stepped voltage - this characteristic is expressed through the musical structure and groove.

The feeling is that a smooth flow locks for a moment, then transitions into the next change.
Accidental fluctuations coexist with regular step changes.
These intertwine, sprouting a unique rhythmic life form on the border between the inorganic and the organic.

No sampling is used, and the concept is entirely analog-inspired.
This track translates the essence of synth functionality into music from PlantsSystem unique perspective.

#synthesizer #sampleandhold #plantssystem"

PlantsSystem - Official Short Playlist 2

video uploads by plantssystem

Playlist:

1. PlantsSystem-Chroma2 #chroma2 #plantssystem #prophet5 #techno #mpc #electronicmusic #synthesizer
2. PlantsSystem-WaveHunter #wavestate #plantssystem #electronicmusic #techno #ipad
3. PlantsSystem-AfterAPlans #renoise #plantssystem #electronicmusic #synth #techno #dtm #sounddesign
4. PlantsSystem-ThirdEmotion #third #emotion #plantssystem #synth #electronicmusic #techno #motiondive
5. PlantsSystem-Circulation #circulation #plantssystem #synth #electronicmusic #prophet5 #techno
6. PlantsSystem-CircuitKoto #koto #plantssystem #synth #electronicmusic #techno #prophet5
7. PlantsSystem-Diminish #diminish #plantssystem #synth #electronicmusic #techno #prophet5 #dr55 #cs10
8. PlantsSystem-PlantsEcho #plantsecho #plantssystem #synth #electronicmusic #prophet5 #techno
9. PlantsSystem-XOver #crossover #plantssystem #techno #electronicmusic #synth #ipad #sounddesign

PlantsSystem-BlueMan

video upload by plantssystem

"PlantsSystem 'Blue Man' is a techno track with an immersive feel that sinks into the depths.
Intensely undulating synthesizer modulation distorts the space, creating an inorganic yet organic groove. The subsonic bass is low and heavy enough to shake your very core, emphasizing the tension of the entire track to the utmost.

A track that combines coolness and heat, suitable for both dance floors and headphones.
#neuromancer #synthesizer #electronicmusic #prophet5 #ipad #techno #tx81z #latelybass #fm #chiba #williamgibson #metal #matrix #cyberpunk"

PlantsSystem-Duos&Prophet-5

video upload by plantssystem

"This video work captures the unpredictable changes in sound that occur when the analog circuits of a Sequential Prophet-5 and a Hikari Instruments Duos are feedback-connected and interfere with each other.
The Prophet-5's rich polyphonic sound stimulates the Duos's sharp circuit response, responding sensitively to even the slightest touches, creating an organic, tense acoustic space.
This experimental work captures, through both sound and video, the moment of feedback, which oscillates between control and rampage.
#plantssystem #prophet5 #polysequencer #duos #hikari"

PlantsSystem - Official Short Playlist

video uploads by PlantsSystem

"We have compiled a playlist of carefully selected songs for smartphones.

This playlist intertwines fragmented images and beats, packing a rich sense of immersion into a short duration.
Looping rhythms, minimal sounds, and sudden grooves—
A collection of sharp, sophisticated electronic music that will stop your scrolling fingers.

Perfect for background music while you work or for a late-night sojourn, this "short but memorable" selection is unique to PlantsSystem."

PlantsSystem-Prophet-5&PolySeq

video upload by plantssystem

"PlantsSystem performed live in the intimate space of a single room using the Prophet-5 and Poly-Seq.

Performer and audience shared the same space, and in a seamless environment, the Prophet-5's rich analog tone and the Poly-Seq's quietly pulsating sequences resonated with each other.

The act of performing itself blended into the living space, resulting in an intimate and immersive performance where the listener could experience the sound-creation process in its entirety.

#plantssystem #prophet5 #polysequencer"

PlantsSystem-Duos&PolySeq ChaosSync

video upload by plantssystem



"PlantsSystem performed using Hikari Instruments' Duos and Sequential's Poly-Sequencer, linked via ChaosSync.

The multiple sequencers interact and influence each other, generating music through a struggle between regularity and chance. The delicate yet sharp modulations of the Duos and the phrase changes made by the Poly-Sequencer overlap, keeping the development constantly fluid.

This experimental live performance, unique to PlantsSystem, showcases the process in which intention and chance emerge simultaneously."