/** Parameters for the ADSR envelope of the synth. */
export type VoiceBaseParams = {
    /** Audio delay in seconds. Increase on Firefox to reduce pops. */
    audioDelay: number;
    /** Attack time in seconds. */
    attackTime: number;
    /** Decay time constant (exponential decay from 1 to `sustainLevel`). */
    decayTime: number;
    /** Steady state amplitude. */
    sustainLevel: number;
    /** Release time constant (exponential decay from `sustainLevel` to 0). */
    releaseTime: number;
};
/**
 * Oscillator with ADSR envelope.
 * Represents a single "channel" of polyphony. Should be reused for multiple notes.
 */
export declare class VoiceBase {
    age: number;
    context: BaseAudioContext;
    envelope: GainNode;
    log: (msg: string) => void;
    noteId: number;
    voiceId: number;
    lastNoteOff?: () => void;
    constructor(context: BaseAudioContext, destination: AudioNode, log: (msg: string) => void);
    noteOn(frequency: number, velocity: number, noteId: number, params: VoiceBaseParams): () => void;
    dispose(): void;
}