MultiTuneKeys - Piano Tunings

MultiTuneKeys — Multi-Temperament Piano Keyboard

A piano keyboard app you can play with a touch. Enjoy it casually, or switch between 7 different tuning systems to hear the differences.

Note: This app does not include piano sound. To make tuning differences clearly audible, it uses 4 simple waveforms (sine, triangle, square, sawtooth — sine and triangle include harmonics control).

Whether you want to play casually in equal temperament, or explore historical tunings like Just Intonation or Pythagorean — from a curious starting point to deep musical study, all in one app.

■ 7 Temperaments
• Equal Temperament (12-TET)
• Just Intonation
• Pythagorean
• 1/4-comma Meantone
• Werckmeister III
• Kirnberger III
• Custom Tuning — fine-tune each note in 1-cent steps within a ±100 cent range

■ Custom Tuning Editor
• 12 vertical sliders aligned with the keyboard
• Set a base note and tune intervals by ear
• Save up to 3 user presets
• Templates: load Just, Pythagorean, Meantone, Werckmeister, or Kirnberger as a starting point
• Real-time audio feedback while adjusting (held notes follow slider changes)

■ HOLD (Sustain) — perfect for pitch reference
• Sustained notes keep ringing after you lift your finger
• Tap a held key again to release just that note
• Great for practicing intonation against a chosen tuning while playing your own instrument

■ Anchor Mode
• A=440 (default): keep A fixed at the reference pitch — historically authentic, ensemble-friendly
• Tonic: keep the tonic at its equal-tempered pitch and let A drift — useful for comparing the same tonic across different tunings

■ Performance Features
• Pitch bend wheel with adjustable range (±1 to ±12 semitones)
• 4 waveforms: Sine, Triangle, Square, Sawtooth
• Harmonics control for Sine and Triangle
• Adjustable master volume
• Reference pitch: A=415 / 432 / 440 / 441 / 442 / 443 Hz or custom
• Haptic feedback on key press
• Loudness curve adjustment per waveform

■ For Musicians & Educators
• Hear the difference between tuning systems instantly
• Perfect for teaching music theory and acoustics
• Compare pure intervals in Just Intonation with Equal Temperament
• Explore historical temperaments used in Baroque and Renaissance music

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