<commit_before>namespace Engine {
    export enum Sounds {
        PowerUp = 0,
        Error = 1
    }

    export class SoundManager {
        private p: HTMLAudioElement;
        private cp: any;
        private bgMusic: HTMLAudioElement;
        private song: any;
        private sounds: Array<string> = [];
        public muted: boolean;

        constructor() {
            this.p = new Audio();
            this.cp = new CPlayer();

            // construct background music
            this.setupBg();

            // to setup another sound
            this.p.volume = 1.0;
            this.sounds[Sounds.PowerUp] = this.setupSound(this.powerUpSound());
            this.sounds[Sounds.Error] = this.setupSound(this.ErrorSound());
<commit_msg>reduced the sound effect volume<commit_after>namespace Engine {
    export enum Sounds {
        PowerUp = 0,
        Error = 1
    }

    export class SoundManager {
        private p: HTMLAudioElement;
        private cp: any;
        private bgMusic: HTMLAudioElement;
        private song: any;
        private sounds: Array<string> = [];
        public muted: boolean;

        constructor() {
            this.p = new Audio();
            this.cp = new CPlayer();

            // construct background music
            this.setupBg();

            // to setup another sound
            this.p.volume = .2;
            this.sounds[Sounds.PowerUp] = this.setupSound(this.powerUpSound());
            this.sounds[Sounds.Error] = this.setupSound(this.ErrorSound());

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