import TimedEvent from './timedEvent';
/**
 * TimedTone generates a pure tone using the Web Audio API. It maps the
 * oscillator lifecycle to TimedEvent lifecycle methods. Note: OscillatorNodes
 * cannot always be restarted after they are stopped, so resume creates a
 * fresh oscillator when necessary.
 *
 * constructor(duration=0, frequency=440, waveform='sine', gain=1.0)
 *  - duration: milliseconds (0 unknown, -1 loop)
 *  - frequency: Hz of the oscillator
 *  - waveform: oscillator type (sine, square, sawtooth, triangle, 'custom')
 *  - gain: output gain (0.0 - 1.0)
 */
export default class TimedTone extends TimedEvent {
    frequency: number;
    waveform: OscillatorType;
    gain: number;
    oscillatorNode: OscillatorNode | null;
    gainNode: GainNode | null;
    constructor(duration?: number, frequency?: number, waveform?: OscillatorType, gain?: number);
    start(): void;
    pause(): void;
    resume(): void;
    cancel(): void;
    setVolume(gain?: number): void;
}
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