This single-file solution implements the requested "Free Banjo Head Tension Tap Tuning Frequency Analyzer". It utilizes the Web Audio API for FFT analysis, offers a reactive SVG-based lug-mapping system, and features a clean, high-precision interface. ```html Free Banjo Head Tension Tap Tuning Frequency Analyzer

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Banjo Head Tension Analyzer

Professional tap tuning lug-mapping utility

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Lug Map (Click to Assign)

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