Rare vintage hardware.
Preserved.

A sampler instrument built from rare and expensive vintage synthesizers — their character, captured sample by sample, on a living oscilloscope.

Get Phosphor · $99
$287K+ Hardware Sampled 500+ Samples 500+ Presets VST3 · AU Mac + Windows
Played live

Real synth sounds, inside.

Phosphor is built to be played, not just browsed. Short clips of me using it like any other instrument — hands on the parameters, no edits, no external processing.

Everything you hear is Phosphor alone. Every parameter is MIDI-mapped to the keyboard — filter, envelopes, effects, all tweaked live while playing.

Sound Demo

Factory presets, raw.

The kind of sounds you get out of Phosphor — recorded straight from the plugin, no processing.

01plucks that drip like water in a crystal cave–:––
02high-energy keys, bright and pushing forward–:––
03cold bells, straight out of an 80s title sequence–:––
04a pad for a lonely night drive, headlights on an empty road–:––
05keys from a haunted ballroom, dust on the chandelier–:––
06glassy plucks over a deep bass line–:––
07an analog bass that pushes the speaker membrane–:––
08strings the way 80s Hollywood scored a slow-motion goodbye–:––
Keep scrolling for more sounds.
Walkthrough

The full tour, in ten minutes.

Every page, every control, every trick — start to finish.

01 / MAIN PAGE

See your
sound.

Play a chord — the tube answers. Everything you need for a quick shape, nothing else.

  • Oscilloscope display — real-time vector figures, morphing with your chords
  • Program bar with RANDOM — step through presets or roll the dice without leaving the page
  • Attack / Release — instant envelope shaping
  • Volume / Tune / Tone — level, pitch and color in one move
09brass from a 70s movie, warm and a little worn–:––
Phosphor MAIN page
Real-Time OscilloscopeReacts to what you play
Macro ControlsQuick sound shaping
02 / EDIT PAGE

Cut. Loop.
Reverse.

A full sample editor on the tube. Zoom into a waveform, shorten it to its sweet spot, loop it into an endless pad — or flip a 50-year-old machine backwards and find textures nobody has heard.

  • Start / End markers — drag any sample down to its best moment
  • Zoom & scrub — wheel to zoom, shift to pan, FIT jumps straight to the loop
  • Loop points L1 / L2 + XFADE — one-shots become seamless endless pads
  • SNAP & NORM — markers lock to zero crossings, levels corrected automatically
  • Reverse — hidden textures, instantly
  • Swap the sample map — new sound source, same patch: FX and envelopes stay put
  • Amp + Filter ADSR — two full envelopes, plus cutoff, resonance and env amount
10a lead that screams once the filter opens–:––
Phosphor EDIT page
Phosphor EDIT page
Sample EditorZoom · Snap · Loop
ReverseFind new textures
Dual EnvelopesVolume + filter ADSR
03 / FX PAGE

Finish it
fast.

Transform your sound with the effects that matter — easy to use, quick results, everything saved with the preset.

  • 3 LFOs + Chorus — volume, pan and filter modulation in five shapes each, plus a real chorus with its own LFO
  • Tempo sync — LFO rates and delay times as note values, 1/1 down to 1/64 triplets
  • Delay — BBD-style stereo repeats, L/R linked or free
  • Reverb — from small room to endless wash
  • FREEZE — lock delay or reverb into an infinite tail
11a broken toy piano, sweet and slightly out of tune–:––
Phosphor FX page
3 LFOs + ChorusNothing sits still
ReverbInstant space
DelayStereo repeats
FreezeInfinite tails
04 / PRESETS PAGE

Find it.
Keep it.

Two browsers in one page. Work through finished presets by category, or skip presets entirely and load raw samples straight from the library — then save what you built.

  • Bank / Program browser — the whole factory library sorted by category
  • Sample browser — load any raw sample on its own, all knobs stay where you left them
  • Favorites — star anything and it collects into its own bank, presets and samples alike
  • Save your own — name it, save it, delete it; factory content stays protected
  • PREV / RANDOM / NEXT — hardware-style function keys under the list
12retro keys, as if played underwater–:––
Phosphor PRESETS page
Phosphor PRESETS page
Preset BrowserBank · Program
FavoritesStar it, find it again
Save Your OwnFactory stays protected
05 / MISC PAGE

Make it
yours.

The instrument adapts to your screen and your taste — and tells you exactly what the engine is doing while you play.

  • Resizable UI — 75, 100, 125 or 150 %; readable on a laptop, comfortable on a 4K screen
  • Three phosphor tints — green, blue or red, and the whole scope changes character with it
  • Grain control — off, low, mid or high: dial the CRT texture up or strip it out entirely
  • 16 voices — voice count and CPU load in the status bar, so you always know the cost
  • Mono mode — one switch turns any patch into a monophonic lead or bass
  • Output meter & MIDI panic — peak-hold metering with a built-in fader, all-notes-off when MIDI hangs
13a warm, nostalgic ensemble, like a memory you can hum–:––
Phosphor MISC page
Phosphor MISC page
Phosphor TintsGreen · Blue · Red
Resizable UI75 → 150 %
Grain ControlOff → High
Hardware Feel

Play and shape it like a real synth.

Every knob is MIDI mappable for flexible control. Grab a MIDI controller, turn a knob, and watch the exact same knob move on the tube — in real time.

Envelope · Filter · MIDI — driven live
Every knob is MIDI mappable Map any knob, fader or pad on your controller and Phosphor moves with you — envelopes, filter and every other parameter respond exactly as you'd expect from real hardware.
Played by handFilter, envelope and pitch moved live on a controller while recording.
14sad keys, played like nobody is listening–:––
15a pad woven from sci-fi textures–:––
16keys for a love you lost and still think about–:––
Hardware Detail

Switch it off. Open the flap.

The monitor isn't just a frame. Click the grey power switch and the tube collapses to a line — LED off, notes cut, the plugin bypassed until you click it again. Click the flap under the screen and it folds down onto three knobs that were always there.

  • PowerBypass with a real switch-off animation. Session only — a preset can never turn the unit off.
  • VolumeOutput trim behind the master volume and every effect. Saved with the preset, automatable.
  • ContrastSays contrast, works as pan — the static stereo position the PAN LFO moves around.
  • BrightnessHow hot the phosphor runs, from a dim glow to a bleeding halo. Visual only, remembered per computer.
Click the flap to open itVolume · Contrast · Brightness
The Collection
Over $287,000 of rare hardware. One plugin.

The Yamaha CS-80 alone costs more than a car. Every sample in Phosphor was captured from the original hardware — sampled over the years in synth studios, private collections, exhibitions and on my own gear, then trimmed, tuned and processed by hand. No emulation, no modeling.

Sampled from original units — over $287,000 of vintage hardware
Yamaha CS-80$80.000 Roland Jupiter 8$35.000 Oberheim OB-X$30.000 ARP 2600$15.000 Oberheim OB-Xa$15.000 Elka Synthex$14.000 Memorymoog$12.000 Prophet 5$10.000 Oberheim OB-8$9.000 Oberheim Xpander$8.000 Minimoog$7.000 Roland Jupiter 6$7.000 Sequential Prophet VS$7.000 ARP Quadra$6.000 Sequential Pro One$3.500 Juno 60$3.000 Moog Source$3.000 Roland SH-2$3.000 Moog Prodigy$2.500 Korg Polysix$2.000 Polivoks$1.500 Moog Matriarch$2.000 Moog Grandmother$1.000 Behringer Poly D$500 Prophet Rev2$2.500 UDO Super 8$3.500 Korg M1$1.000 Roland D-50$1.000 Korg DW-8000$1.000 Yamaha DX7$500
Sampled Hardware — 30 Machines Total worth over $287,000
Yamaha CS-80
Yamaha CS-80$80.000
Roland Jupiter 8
Roland Jupiter 8$35.000
Oberheim OB-X
Oberheim OB-X$30.000
ARP 2600
ARP 2600$15.000
Oberheim OB-Xa
Oberheim OB-Xa$15.000
Elka Synthex
Elka Synthex$14.000
Memorymoog
Memorymoog$12.000
Prophet 5
Prophet 5$10.000
Oberheim OB-8
Oberheim OB-8$9.000
Oberheim Xpander
Oberheim Xpander$8.000
Minimoog
Minimoog$7.000
Roland Jupiter 6
Roland Jupiter 6$7.000
Sequential Prophet VS
Sequential Prophet VS$7.000
ARP Quadra
ARP Quadra$6.000
Sequential Pro One
Sequential Pro One$3.500
UDO Super 8
UDO Super 8$3.500
Roland Juno 60
Roland Juno 60$3.000
Moog Source
Moog Source$3.000
Roland SH-2
Roland SH-2$3.000
Prophet Rev2
Prophet Rev2$2.500
Moog Prodigy
Moog Prodigy$2.500
Korg Polysix
Korg Polysix$2.000
Moog Matriarch
Moog Matriarch$2.000
Polivoks
Polivoks$1.500
Korg M1
Korg M1$1.000
Roland D-50
Roland D-50$1.000
Korg DW-8000
Korg DW-8000$1.000
Moog Grandmother
Moog Grandmother$1.000
Behringer Poly D
Behringer Poly D$500
Yamaha DX7
Yamaha DX7$500
17popstar stabs, bright enough to carry a chorus–:––
18plucks that tick like a bank heist countdown–:––
19plucks from a 70s cop drama, nervous and funky–:––
20keys soft enough for a lullaby–:––
Reviews

What producers say.

"If you know Kleemann's demos on Instagram, you know that sound — warm, vintage, unmistakably eighties. Phosphor captures it perfectly. The presets are rich with authentic analog character, not a generic 'retro' filter but the real texture Kleemann is known for. What stands out beyond the sound is the attention to detail: a clean, thoughtful UI plus a few hidden surprises tucked into the plugin that reward curious users. If you don't own Kleemann's actual synth collection (most of us don't), Phosphor is the perfect shortcut to that sound. Highly recommended."

Francisco

"I really like the feeling of Phosphor! The GUI with its retro touch really feels like it is made with love. Its presets & samples are well curated and contain a fantastic sounding variety of sophisticated oldschool synths. It also offers great tools for editing its samples and for sound design. The little easter eggs add to the already cool touch Phosphor has. All in all great work from a great creative mind. Do not miss out on Phosphor!"

Lukas
Beta tester · @luka_sakul

"What stood out to me was how easy it was to create sounds with real emotional depth. The 'Hans Zimmer' pad was my personal highlight. I had a lot of fun exploring the sounds, especially playing around with the delay section."

Tim
Beta tester · @tim332547

"I definitely love Phosphor. I made a few beats with it. I'll send you one when it's finished."

Noah
Beta tester · @noahknuts

"The sounds are phenomenal. They have this incredible vintage vibe that works perfectly for old-school electronic music, but at the same time, they sound totally relevant and fresh for modern, new-school production. It's extremely versatile. Every single patch feels highly authentic and beautifully, crisply recorded. It is such an inspiring, unique, and unusual plugin to work with, and I'm honestly amazed by how lightweight it is. It doesn't weigh much at all, yet the sonic weight is massive. This is a top-tier, exceptionally well-done piece of work. For anyone who loves fat analog warmth and gritty retro textures, this plugin is an absolute must-have. You nailed it!"

Ilya
Beta tester · @ily11.wav
One more thing

Can you find the hidden game ROM?

Somewhere in Phosphor, the oscilloscope stops drawing your chords and boots a menu of six playable games instead. No hints — you'll know it when you hit it.

6 games hidden inside the plugin
Phosphor running its hidden mini game
Choose Your Bundle

One payment. Yours forever.

No subscription. Free updates for all registered users.

Phosphor plugin
Phosphor
The Instrument
$99
  • 500+ samples from $287K of vintage hardware
  • 500+ presets — production-ready instruments, plus your own
  • Full engine — sample editor, dual ADSR, filter, 3 LFOs, chorus, delay, reverb with FREEZE
  • Preset & sample browser — favorites, tempo sync, 16 voices, mono mode
  • Live vector oscilloscope in three phosphor tints, UI scales 75–150 %
  • Free updates · one license for up to 3 devices
Get Phosphor — $99
Best Value — Save $99
Full Academy bundle
Phosphor + Academy
The Complete Package
$197$296
  • Phosphor + everything in the Academy (over $500 value):
  • 15+ hours of step-by-step synth training
  • 5 complete courses — Grandmother, Poly D, build studio, music theory, sound design
  • Sound packs, presets, ebooks & web apps
  • Personal 1-on-1 call — 45 min, tailored to you
Get The Bundle — $197
Secure checkout via Gumroad
VST3 · AU · 64-bit macOS 10.13+ Windows 10+ ~1 GB install Serial activation
Still deciding?Two more, straight from the factory bank.
21blurry keys, like a photograph left in the sun–:––
22melancholic keys, slowed until they ache–:––
Read Before You Buy

The full manual. No account required.

Every page, every knob, every parameter — read it in your browser or keep the PDF. It's the same manual that ships with the instrument.

PHOSPHOR User Manual — cover 22 pages · 7.2 MB

Know exactly what you're getting.

From install and activation to the sample editor, both envelopes, the three LFOs, delay & reverb with FREEZE, the power switch and the flap on the housing, host automation and a page of sound design recipes. If it's in Phosphor, it's in here.

  • 01Welcome
  • 02Installation & Activation
  • 03Quick Start — Your First Five Minutes
  • 04The Interface — screen, knobs, power switch & flap
  • 05MAIN — Scope & Macros
  • 06EDIT — Sample Editor, Envelope & Filter
  • 07FX — LFO, Chorus, Delay & Reverb
  • 08PRESETS — Browsing, Favorites & Saving
  • 09MISC — System, License & Display
  • 10Status Bar — Voices, CPU, Meter & Mono
  • 11MIDI & Host Automation
  • 12Sound Design Recipes
  • 13Troubleshooting & FAQ
  • 14Specifications, License & Support
FAQ

Questions.

Anything else? kleemann@synthskool.com

Which DAWs and systems are supported?
Phosphor works in every DAW that loads VST3 or AU plugins — FL Studio, Ableton Live, Logic Pro, Studio One, Cubase, Reaper, Bitwig and more. Windows 10+ or macOS 10.13+, 64-bit.
Is this a subscription?
No. Phosphor is a one-time purchase. All future updates are free for registered users.
Where do the samples come from?
From my own sample library, built up over the years: sessions in synth studios, private collections, exhibitions and my own gear — recorded from the real hardware, then trimmed, tuned and processed by hand before being mapped chromatically. Phosphor is that library turned into an instrument. No emulation, no modeling.
How does activation work?
After purchase you receive a serial key by email. Open Phosphor, paste the key, done. One license works on up to 3 of your own devices. Copy the key exactly as sent, with no extra spaces around the dashes.
Can I save my own presets?
Yes. Name a patch and save it into your own user bank — it sits alongside the factory library in the browser and can be renamed or deleted any time. Factory content is write-protected, so you can't overwrite it by accident. You can also star any preset or sample as a favorite, which collects it into its own bank at the top of the list.
The interface is a fixed screen — can I resize it?
Yes, on the MISC page: 75, 100, 125 or 150 %. The whole instrument scales with it, so it stays readable on a laptop and comfortable on a large display. You can also switch the oscilloscope between green, blue and red, and set the CRT grain from off to high.
How large is the download?
The full installer including all samples is roughly 1 GB. Samples install as optimized instrument banks — no manual sample-path setup, the installer handles everything.
One payment, yours forever

Decades of hardware.
One instrument.

$99 — one payment, free updates.

23a retro lead echoing through an empty venue–:––
24a pluck that pulses like a nervous heartbeat–:––
25a vintage bass with fuzz around the edges–:––
Get Phosphor · $99