export type ChangeEventPayload = {
    /** Note name without octave (e.g., "C#", "D", "Eb") */
    note: string;
    /** Octave number (e.g., 4 for middle C) */
    octave: number;
    /** Raw frequency in Hz */
    frequency: number;
    /** Offset from perfect pitch as percentage (-50 to +50, negative = flat, positive = sharp) */
    offset: number;
    /** Signal amplitude in dB SPL (approximate) */
    amplitude: number;
};
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