/**
 * SynthEngine.ts
 *
 * Software synthesizer: oscillators (sine/square/saw/triangle),
 * ADSR envelopes, filters, wavetables, and polyphony.
 *
 * @module audio
 */
export type WaveformType = 'sine' | 'square' | 'saw' | 'triangle' | 'noise' | 'wavetable';
export interface ADSREnvelope {
    attack: number;
    decay: number;
    sustain: number;
    release: number;
}
export interface OscillatorDef {
    id: string;
    waveform: WaveformType;
    frequency: number;
    amplitude: number;
    phase: number;
    detune: number;
    envelope: ADSREnvelope;
    wavetable?: number[];
}
export interface SynthVoice {
    id: string;
    oscillator: OscillatorDef;
    noteOn: boolean;
    noteOnTime: number;
    noteOffTime: number;
    currentAmplitude: number;
    elapsed: number;
}
export interface FilterDef {
    type: 'lowpass' | 'highpass' | 'bandpass';
    cutoff: number;
    resonance: number;
}
export declare class SynthEngine {
    private voices;
    private maxPolyphony;
    private masterVolume;
    private filter;
    private sampleRate;
    noteOn(frequency: number, waveform?: WaveformType, envelope?: Partial<ADSREnvelope>): string;
    noteOff(id: string): void;
    generateSample(time: number): number;
    private computeEnvelope;
    update(dt: number): void;
    setMasterVolume(vol: number): void;
    setMaxPolyphony(n: number): void;
    setFilter(filter: FilterDef | null): void;
    getFilter(): FilterDef | null;
    getActiveVoiceCount(): number;
    getVoice(id: string): SynthVoice | undefined;
    getMasterVolume(): number;
}
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