PitchGrid is a studio-grade audio frequency generator and musical microtonal workbench crafted for sound designers, acoustic engineers, synth enthusiasts, and musicians.

Engineered with a pure native Android 44.1 kHz PCM audio synthesis engine, PitchGrid produces mathematically pure waveforms in real time with zero latency, zero audible popping, and zero cloud dependencies.

KEY STUDIO FEATURES:

1. REAL-TIME MULTI-WAVEFORM OSCILLATOR
• Sine: Pure fundamental harmonic tone for acoustic calibration and resonance isolation.
• Triangle: Warm, mellow waveform with odd-order harmonics.
• Sawtooth: Rich analog synth harmonic spectrum for filter and gear testing.
• Square: Punchy vintage pulse wave with odd harmonic series.
• Pink Noise: -3 dB/octave acoustic reference noise for room and speaker response calibration.

2. HARDWARE-ACCELERATED CRT OSCILLOSCOPE
• Live audio waveform visualizer with phosphor glow persistence.
• Calibrated division reticle grid and real-time amplitude tracking.
• Instant visual feedback of frequency and harmonic shape changes.

3. MICROTONAL & MUSICAL WORKBENCH
• Continuous 20 Hz to 20,000 Hz coverage with smooth logarithmic sweep seekbar.
• Precision sub-Hz nudging (+1, -1, +10, -10, +100, -100 Hz) and direct numerical frequency input.
• Full musical note mapping from C0 to B8 with octave transpositions.
• Microtonal cents fine-tuning dial (-50 to +50 cents) with instant center reset.
• Reference concert pitch calibration: A4 = 440 Hz (Standard), A4 = 432 Hz (Pythagorean / Verdi), A4 = 444 Hz.
• 1-tap harmonic interval transposition: Major 3rd (5:4), Perfect 4th (4:3), Perfect 5th (3:2), Octave (2:1).

4. AUTOMATED FREQUENCY SWEEP & CALIBRATION
• Continuous 20 Hz to 20 kHz automated logarithmic frequency sweep for testing speakers, headphones, and room standing waves.
• Output attenuation control with calibrated decibel (dB) and percentage readout.

5. PRESETS & CALIBRATION VAULT
• Built-in factory benchmarks: 440 Hz Concert Pitch, 432 Hz Natural Tuning, 1 kHz Line Level Reference, 60 Hz Ground Hum, 40 Hz Subwoofer Resonance, and Guitar String Tunings.
• Save unlimited custom frequency and waveform presets to local SQLite storage.

6. ZERO-BLOAT NATIVE PERFORMANCE
• 100% offline-first. Zero internet permissions required.
• Zero telemetry, zero analytics, zero ads.
• Quick Settings Tile for instant 1-tap playback from your notification shade.
• Tactile synthesizer rack aesthetic with Day, Night, and System Auto theme switching.