Last updated 05 Feb 2025

Studio J: John deLaubenfels' Just Intonation project

Steganography: Stegmeister







Head Demagnetizers in 32 bars

Don't try to play along: none are in any key on the piano keyboard.

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Chords used in above examples



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Project Retune: the retuning of General MIDI files to adaptive quasi-Just Intonation (qJI).

Warning: the tunings presented here are unauthorized by the original composers.

Basic tuning theory
Basic tuning math
My spring method
Calculated Optimum Fixed Tuning (COFT)
Working details of tuning program
Message to parents


Hardware requirements: to play the following files, you need General MIDI (GM) capability. Most computer sound cards made in the last five years have this, as do most stand-alone modules in the same time period. If in doubt, give one of the tuned files a try. If notes are missing, you probably don't have GM. If notes seem poorly tuned, see below.


Results using "melodic springs":

Gershwin "Rhapsody in Blue" (2-hand piano reduction), sequenced by Gary D. Lloyd:
rh-n-blum.zip Positive, negative, and zero-strength melodic springs with 7-limit adaptive tuning.

Chopin "Fantaisie-Impromptu", Op. 66, sequenced by Larry Ellis:
lechi4jm.zip Positive, negative, and zero-strength melodic springs with 5-limit adaptive tuning.

David J. Finnamore "Romantic Sixth Chords Experiment", sequenced by David J. Finnamore, copyright (c) 2001 David J. Finnamore.
Rmtcsixt.zip

Chopin "Fantaisie-Impromptu", Op. 66, sequenced by Larry Ellis:
lechi4j.zip Original and some tunings
lechi4jx.zip More tunings

Bach/Busoni "Chaconne in D-", sequenced by Bunji Hisamori, with chorus commands removed:
b-b-bj.zip

Mozart Sonata No.2 in F, K.280, sequenced by F. Raborn.
wamk280.zip
wamk280es2.zip

Here's some multi-voice stuff I've been doing:
caravan.zip
pearls.zipA String of Pearls"
KeyedSeqs.zipKeyed instruments restricted in tuning.
verk-nac2.zip:Monz's sequence of Schoenberg's "Verklarte Nacht", 01-06-01




Having trouble with these sequences: do they sound badly out of tune? You might have a different pitch bend range. Try downloading this to check your bend range; you should hear E, F#, and D. Try downloading this to fix the problem. Send me e-mail and let me know how it goes...


And now for something completely different:
Political rants


JIRelay sits between a midi keyboard and a General Midi synth, and adaptively tunes in real-time.

Download JI Relay for Windows