/**
 * Predominant Local Pulse (PLP) estimation
 */
export function plp(y?: any, sr?: number, onset_envelope?: any, hop_length?: number, win_length?: number): Float32Array<any>;
/**
 * Beat-synchronous feature aggregation
 */
export function beat_sync(data: any, beats: any, aggregate?: string): Float32Array<ArrayBuffer> | Float32Array<ArrayBuffer>[];