Shepard Keyboard

DS soft

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About this app

Shepard Keyboard: High-Performance Infinite Pitch Synthesizer

Unlock the auditory illusion of the "infinite scale" with a professional synthesizer designed for both sound design and live performance.

Shepard Keyboard generates Shepard Tones—a psychoacoustic phenomenon where sounds appear to rise or fall in pitch forever while remaining within their octave. We have transformed this scientific curiosity into a highly expressive, low-latency musical instrument.

【Advanced Performance & Expression】
- Dynamic Key Control: Change volume, vibrato, and filter intensity in real-time based on where you tap the keyboard.
- Seamless Slide Playing: Hold and slide across keys for smooth pitch transitions—ideal for guitar-like slides and glissando effects.
- Pseudo-Octave Jump: Overcome the traditional limitations of Shepard Tones. Simulate octave leaps by shifting the center frequency to half or double its value at the touch of a button.
- X-Y Pad Controllers: Intuitive dual-axis pads for real-time manipulation of the Low-Pass Filter (LPF), Resonance, and Frequency Range.

【Professional Audio Architecture】
- Ultra-Low Latency: Built with Google’s Oboe (C++) library to ensure near-instant touch-to-sound response, optimized for the Android platform.
- Full Envelope Control: Precision ADSR (Attack, Decay, Sustain, Release) settings. Includes a "Fixed Duration" mode for percussive, glockenspiel-like tones.
- High-Fidelity Filters: Integrated LPF and Resonance controls to shape everything from haunting sub-basses to ethereal, piercing leads.
- Overdrive & Modulation: Add grit and movement to your infinite scales with dedicated effects and pitch bend bars.

【Key Features】
- Infinite Shepard Tone Engine: Perfectly layered octaves for a seamless, never-ending pitch illusion.
- Audio Integration: Load and play your own audio files alongside the synthesizer for practice or sampling.
- Velocity Sensitivity: Tapping the bottom of the keys produces louder, more forceful sounds.
- Preset Management: Save and load your custom envelope and sound settings instantly.
- Screen Recording Optimization: Includes a dedicated mode for stable audio during screen captures.

【Detailed User Manual】
Master the infinite scale with our comprehensive visual guide:
https://docs.google.com/presentation/d/1fuiwogr7H3Mv6T7IUy5FcggWQ3p_RZXfCQXxu8idgj8/edit?usp=sharing

【Ideal For】
- Sound Designers: Create tension and "unending" build-ups for cinematic scoring and game audio.
- Experimental Musicians: Explore the boundaries of psychoacoustics and microtonal performance.
- Live Performers: A stable, responsive C++ based instrument designed for professional use.

Developer's Note:
This app leverages professional-grade C++ audio libraries to minimize latency. By mastering the frequency shifting and real-time filter controls, you can breathe organic life into the mathematical beauty of the infinite scale.

What’s new

Improved performance expression (octave jumps, XY pad, audio file loading, slide technique)