import { SoundStorageArea } from './SoundStorageArea'; export class DriveRegisteredSoundParameter { private _area: SoundStorageArea; private _number: number; private _volume: number = -1; get area(): SoundStorageArea { return this._area; } get number(): number { return this._number; } get volume(): number { return this._volume; } constructor(area: SoundStorageArea, number: number) { this._area = area; this._number = number; } setVolume(volume: number): DriveRegisteredSoundParameter { this._volume = volume; return this; } }