import type { AudioEffect } from '../interfaces';
export interface PitchManagerOptions {
    pitch?: number;
    speed?: number;
    randomness?: number;
    melodyRate?: number;
    melodyAmplitude?: number;
}
/**
 * Audio effect that manages pitch and speed adjustment for synthesized speech.
 */
export declare class PitchManager implements AudioEffect {
    readonly pitch: number;
    readonly speed: number;
    readonly randomness: number;
    readonly melodyRate: number;
    readonly melodyAmplitude: number;
    constructor(options?: PitchManagerOptions);
    calculatePitch(charIndex: number): number;
    apply(buffer: Float32Array, pitchRatio: number): Float32Array;
}