For three centuries, every keyboard made D♯ and E♭ the same note.
The mmk changes that. For the first time in history.
"The only keyboard in the world where D♯ and E♭ sound different. Where F𝄪 and G are distinct notes. Where enharmony ceases to exist — because in the pure nature of sound, it never did."
— Mario Maurano · Contrabassist · Former Principal Bass, BRT Philharmonic & Orchestre Philharmonique de Liège
Equal temperament — the tuning system used by every piano, organ, and digital keyboard since the 18th century — erases a small but audible difference between notes that are mathematically distinct. Professional orchestras have always compensated for this. Until now, no keyboard let you play those differences directly.
From the smallest digital piano to the most expensive concert grand — one key. Two names. One frequency. Equal temperament has no room for the truth.
Two physically separate zones. Two mathematically exact Pythagorean frequencies. The Pythagorean comma — known for millennia, playable for the first time on a keyboard.
Music Motion basic runs entirely in your browser — no installation, no plug-ins. Play it now. Record in .mmf format. Hear the Pythagorean comma for the first time.
The software you're playing is free and always will be.
The physical mmk keyboard — currently in development — brings this into your hands.
The .mmf format — Music Motion Format — is the thread that connects everything. Unlike MIDI, it stores exact Hz frequencies. It is the only format that can represent the Pythagorean comma in a recording.
The browser keyboard you just played. 35 Pythagorean pitches, 19 instruments, .mmf recorder, 12 languages. The foundation of the ecosystem — and always free.
The physical keyboard. USB-HID, RP2040, two octaves. Three zones per black key. The Pythagorean comma in your hands — for the first time on any keyboard in the world.
Full composition environment. .mmf playback and writing. MIDI import with Pythagorean correction engine. Priced at €249 — accessible to every musician.
I spent 35 years as a professional orchestral bassist — 18 years as principal bass of the BRT Philharmonic Orchestra, 17 years at the Orchestre Philharmonique de Liège. Every night, in every rehearsal, I heard what keyboards cannot play.
String players, woodwind players, singers — we all adjust our intonation in real time. We play D♯ higher than E♭ because harmonically they are different. Every musician trained in pure intonation knows this. And every time we sat at a piano, the instrument lied.
I started developing Music Motion in 2001. Not as a product — as a way to think clearly about something that had bothered me for decades. The software grew. The .mmf format emerged. The physical keyboard is the next step, and it needs the support of musicians who understand what it means.
This is a pre-campaign interest register. When enough musicians have expressed support, the Kickstarter goes live. Early backers receive the mmk below its launch price.
Note for musicians in Latin America and other regions: The €49 Supporter tier and the free mm basic software are specifically accessible entry points. The full mmk at €99 launch price is equivalent to a quality bow accessory or a set of professional strings — within reach for the serious musician anywhere in the world.
For those who believe in the work · No minimum
Digital rewards only · No hardware
Estimated delivery: 2027 · Save €20 vs launch
Save €55 vs buying separately · Full mm ecosystem
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The campaign is not live yet — but if you want to show real commitment today, you can send a symbolic amount directly via PayPal. Every gesture counts and every supporter will be acknowledged.
Support via PayPalVoluntary gesture of support · Not a purchase · No hardware is sent