import { Param } from "../core/context/Param";
import { OutputNode, ToneAudioNode, ToneAudioNodeOptions } from "../core/context/ToneAudioNode";
import { Decibels, Frequency, NormalRange, Time } from "../core/type/Units";
export interface InstrumentOptions extends ToneAudioNodeOptions {
    volume: Decibels;
}
/**
 * Base-class for all instruments
 */
export declare abstract class Instrument<Options extends InstrumentOptions> extends ToneAudioNode<Options> {
    /**
     * The output and volume triming node
     */
    private _volume;
    output: OutputNode;
    /**
     * The instrument only has an output
     */
    input: undefined;
    /**
     * The volume of the output in decibels.
     * @example
     * import { AMSynth } from "tone";
     * const amSynth = new AMSynth().toDestination();
     * amSynth.volume.value = -6;
     * amSynth.triggerAttackRelease("G#3", 0.2);
     */
    volume: Param<"decibels">;
    /**
     * Keep track of all events scheduled to the transport
     * when the instrument is 'synced'
     */
    private _scheduledEvents;
    /**
     * If the instrument is currently synced
     */
    private _synced;
    constructor(options?: Partial<InstrumentOptions>);
    static getDefaults(): InstrumentOptions;
    /**
     * Sync the instrument to the Transport. All subsequent calls of
     * [[triggerAttack]] and [[triggerRelease]] will be scheduled along the transport.
     * @example
     * import { FMSynth, Transport } from "tone";
     * const fmSynth = new FMSynth().toDestination();
     * fmSynth.volume.value = -6;
     * fmSynth.sync();
     * // schedule 3 notes when the transport first starts
     * fmSynth.triggerAttackRelease("C4", "8n", 0);
     * fmSynth.triggerAttackRelease("E4", "8n", "8n");
     * fmSynth.triggerAttackRelease("G4", "8n", "4n");
     * // start the transport to hear the notes
     * Transport.start();
     */
    sync(): this;
    /**
     * Wrap the given method so that it can be synchronized
     * @param method Which method to wrap and sync
     * @param  timePosition What position the time argument appears in
     */
    protected _syncMethod(method: string, timePosition: number): void;
    /**
     * Unsync the instrument from the Transport
     */
    unsync(): this;
    /**
     * Trigger the attack and then the release after the duration.
     * @param  note     The note to trigger.
     * @param  duration How long the note should be held for before
     *                         triggering the release. This value must be greater than 0.
     * @param time  When the note should be triggered.
     * @param  velocity The velocity the note should be triggered at.
     * @example
     * import { Synth } from "tone";
     * const synth = new Synth().toDestination();
     * // trigger "C4" for the duration of an 8th note
     * synth.triggerAttackRelease("C4", "8n");
     */
    triggerAttackRelease(note: Frequency, duration: Time, time?: Time, velocity?: NormalRange): this;
    /**
     * Start the instrument's note.
     * @param note the note to trigger
     * @param time the time to trigger the ntoe
     * @param velocity the velocity to trigger the note (betwee 0-1)
     */
    abstract triggerAttack(note: Frequency, time?: Time, velocity?: NormalRange): this;
    private _original_triggerAttack;
    /**
     * Trigger the release phase of the current note.
     * @param time when to trigger the release
     */
    abstract triggerRelease(...args: any[]): this;
    private _original_triggerRelease;
    /**
     * clean up
     * @returns {Instrument} this
     */
    dispose(): this;
}