A major update that significantly expands the possibilities of the application, introducing new tuning systems, PTT Shimmer, new research and performance tools, enhanced visualizations, and major improvements to MIDI, MPE, the interface, shortcuts, and performance.
Expanded Tuning Library — New tuning systems and updated implementations of existing tunings;
PTT Shimmer Tunings — Integration of the 24-PTT Dual-Track Shimmer developed by Robert E. Grant in 2026;
PTT Shimmer Lab — New controls for experimenting and performing with Dual-Track Shimmer, including volume compensation, fixed velocity, and MIDI expressivity filters;
Shimmer Waveform Visualization — Real-time visualization of the waveform created by Dual-Track Shimmer in the Spiral Viewer;
144-Note Piano & Expanded Polyphony — Extended keyboard range and polyphony for large-scale tuning exploration and complex MIDI performances;
Expanded Piano Performance Controls — New mouse and QWERTY modifier controls for sequential 12-note, 88-note, and full 144-note performances, with ascending and descending playback, octave-wide pitch-class triggering, selectable starting notes, and automatic frequency-label collision avoidance;
Floating QWERTY Display — Visual feedback for computer keyboard note mappings, including Standard and Full modes;
Enhanced Color System — A unified color palette across the viewers, with luminance compensation to improve frequency differentiation and visibility across different screen sizes;
Enhanced Sustain Control — Improved sustain behavior with individual sustained-note release directly from the piano while keeping the remaining sustained notes active;
Expanded Shortcut System — New shortcuts and key combinations for faster access to the main functions, viewers, and performance controls;
Viewer Improvements — New visualization options, including Large Viewer, grid controls, and enhancements to the Spiral Viewer, Equal Analyzer, Spectrogram, and Vectorscope;
MIDI & MPE Improvements — Enhancements to MIDI input and output, pitch bend, sustain, MIDI Thru, and MPE operation;
Equal Analyzer Improvements — Extended low-frequency visualization and FFT analysis of up to 32,768 samples;
Interface & Usability Improvements — Refined visuals, navigation, scaling, and overall workflow;
Performance & Stability — Multiple fixes and optimizations throughout the application.
[Release date]
First public release of 432 528 Tunings, a free online application created to explore and compare alternative musical tuning systems based on 432 Hz, 528 Hz, Precise Temperament Tuning, and related research.
12 Tuning Systems — Sound and visual comparison of alternative tunings based on 432 Hz, 528 Hz, and 440 Hz;
Multiple Playing Methods — Play notes using MIDI controllers, the computer QWERTY keyboard, or the mouse;
MIDI & MPE Support — Play and control tunings through MIDI and MPE-compatible devices, with input and output support;
External Instrument Tuning — Tunes compatible software and hardware instruments through MIDI ports on Mac and Windows;
Interactive Visualizers — Spiral Viewer, Equal Analyzer, Spectrogram, and Vectorscope for real-time frequency and audio analysis;
432/440 Hz Audio Conversion — Converts audio between 432 Hz and 440 Hz while maintaining full quality;
Scientific Pitch Notation — Frequency grids and note displays based on Scientific Pitch Notation;
Reference Waveforms — Saw, Sine, Octaves, and Noise for tuning comparison and analysis;
Performance Loops — Integrated loop system for intervals, glissandos, and musical sequences, with speed control;
Tuning Information — Detailed information about each tuning system, its frequencies, theoretical principles, and associated theorists;
Extensive QWERTY Shortcut Library — Keyboard shortcuts providing fast access to the application’s main functions;
Built-in Start Guide — Integrated guidance for learning the application and its main features;
Free & Browser-Based — Runs directly in a web browser without installation, across major operating systems and devices.
432 528 Tunings
Created by Toni Mazzotti
Free online application for musical tuning research, education, and experimentation.
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