Spiral Piano: Explore Microtonal Equal Temperaments

Microtonal Spiral Piano is an interactive tool for exploring equal-tempered microtonal scales beyond 12-TET. It features curated temperaments (19, 24, 31, 53-TET) tied to historical and global traditions, playable via a spiral interface and two-tier keyboard mapping. Sound design controls and 2D/3D visualizations support hands-on discovery of microtonal harmony.

Key Points

• Bridges Western music with non-Western and historical tunings via equal temperament systems (N-TET).
• Supports 12-, 19-, 24-, 31-, and 53-TET, each chosen for distinct musical traditions and interval qualities.
• Interactive spiral interface enables clicking/tapping and drag-based microtonal glissandi.
• Keyboard mapping uses two octave tiers (Z-/ lower, Q-P higher), with guidance for guitarists.
• Built-in sound design and visual tools (wavetable, unison, filters, ADSR; 2D/3D visuals) aid exploration of microtonal harmony.

Sentiment

The discussion is clearly positive and supportive. Commenters appreciate both the creative concept and the execution, finding the spiral layout genuinely insightful for understanding harmonic relationships. Criticism is entirely constructive, focused on UX improvements rather than questioning the project's value. Hacker News broadly agrees this is a worthwhile and interesting tool.

In Agreement

• The spiral positioning better illustrates harmonic relationships between octaves than a traditional linear keyboard layout
• The tool is delightful to interact with, especially running fingers across keyboard rows for microtonal glissandi
• The audio performance monitor is a valuable debugging approach for Web Audio development
• The concept of bridging Western music with global and historical tuning systems through interactive exploration is appreciated

Opposed

• The app is unusable on mobile browsers — centering issues prevent scrolling to access the full interface
• Desktop browser compatibility is poor, with horizontal overflow in Firefox requiring window maximization
• The core microtonal tuning settings are buried behind a gear icon, making the main feature hard to discover
• The default sound quality is xylophone-like rather than resembling a piano or richer instrument