ReString - Guitar Tuner & Care

ReString Logger
A scientific platform for classical guitar string tracking, acoustic analysis, and structured practice.

String choice, tension, aging, and physical acoustic properties fundamentally shape classical guitar performance. ReString Logger combines string change logs, stock inventory, and review tracking with real-time Digital Signal Processing (DSP): precision strobe tuning, string quality inspection, timbre analysis, technique practice diagnostics, and a hands-free studio loop recorder.

[1] String Logging & Dashboard
- Track active string days, tension metrics, and wear progression.
- Replacement cycle reminders and concert countdown alerts.
- Record detailed impressions, feel, and tonal notes with star ratings.

[2] Ultra-Precision Strobe Tuner & Dedicated Temperaments
- +/-0.1 cent accuracy powered by phase accumulation strobe animation.
- Auto string detection and Auto-Snap tuning that locks pitch once attack transients settle.
- Classical guitar optimizations:
* Key Optimization: Suppresses 3rd-string beat distortion to sweeten tonic and dominant chords.
* Chord Optimization: Compensates for fretting tension increases on lower frets.
* Dyad Beat Tuning: Real-time visualization of beat frequencies (Hz) and modulation depth.

[3] String Quality Assurance (String QA)
- Detect manufacturing defects, density irregularities, and baseline decay immediately after restringing.
- Measure open-string sustain decay, roundness/core balance, and harmonic stability.
- Compare 12th-fret natural harmonics against 12th-fret fretted notes (cents offset) to verify string accuracy and saddle compensation.

[4] Guitar Timbre Analyzer
- Guided 6th-to-1st string wizard captures the acoustic fingerprint of your guitar and strings.
- Computes spectral centroid (brightness), sustain decay time (T30), harmonic partial profiles (1st to 8th), and odd/even harmonic ratios.
- Dual-take overlay comparison: compare different string sets or track tonal aging over weeks with objective physical metrics and diagnostic insights.

[5] Technique Practice Analyzer
- Quantitative feedback based on acoustic metrics instead of gamified scores.
- Tremolo (p-a-m-i): Stroke interval jitter, timing evenness (%), and per-finger dynamic balance.
- Arpeggio: String sequence fidelity and attack timing uniformity.
- Single-String Alternation (i-m, m-a, i-a): Inter-finger timing ratio (target 50:50), volume consistency, and timbre parity (spectral centroid).

[6] Precision Acoustic Metronome
- Jitter-free, low-latency audio engine with woodblock, click, and beep sounds.
- Natural physical pendulum visualizer with power-efficient rendering.
- Smart Tempo Detection: Estimates your playing BPM directly from microphone input.

[7] Hands-Free Studio Loop Recorder
- Auto-triggers recording from the very first pluck attack (Armed mode).
- Loop Practice Mode: Automatically stops after musical silence (with debounce immunity against external metronome clicks) and replays in a continuous loop.
- Performance Take Mode: High-fidelity uncompressed take recording and export.

[8] Stock, Spec Database & Community
- Track spare sets and single strings in your inventory.
- Built-in classical guitar string database with materials and tension specifications.
- Instrument profiles, community reviews, and public guitar timbre gallery.

Professional Acoustic DSP: Pure Dart DSP core delivering ultra-low latency, zero-allocation real-time loops, and background Isolate analysis for smooth 60-120 fps animations.

Recent changes:
• Added high-precision resonance suppression to the tuner (enabled by default, can be disabled in settings)
• Added "Conditions & Notes" to timbre data and enabled editing measurement conditions afterwards
• Added update notice dialog on app launch
• Improved timbre analyzer feature
• Improved string search/comparison integration with favorite strings
• Fixed an issue where the pitch ribbon graph would freeze or not update
• UI/UX improvements