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Add Reference Frequency Fine Tuning #12

@pbalduino

Description

@pbalduino

Description

Allow fine adjustments to A4 reference frequency in ±0.5 Hz increments

Priority

🟢 Low

Category

Feature

Details

  • Extend settings screen to allow A4 frequency adjustment
  • Support range from 430-450 Hz with 0.5 Hz increments
  • Update frequency calculations throughout the app
  • Save preference to local storage

Files Affected

  • lib/screens/settings_screen.dart
  • lib/screens/tuner_screen.dart

Acceptance Criteria

  • Settings screen shows A4 frequency control
  • Frequency can be adjusted in 0.5 Hz increments
  • All frequency calculations use the set reference
  • Setting persists between app restarts

Task ID: CONFIG-001

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enhancementNew feature or requestfeatureNew featuressettingsSettings and configuration

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