osukey/osu.Game/Audio/AudioLoadWrapper.cs

using osu.Framework.Allocation;
using osu.Framework.Audio;
using osu.Framework.Audio.Track;
using osu.Framework.Graphics;
using osu.Game.Beatmaps;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace osu.Game.Audio
{
    public class AudioLoadWrapper : Drawable
    {
        private readonly string preview;

        public Track Preview;

        public AudioLoadWrapper(string preview)
        {
            this.preview = preview;
        }

        [BackgroundDependencyLoader]
        private void load(AudioManager audio)
        {
            if (!string.IsNullOrEmpty(preview))
            {
                Preview = audio.Track.Get(preview);
                Preview.Volume.Value = 0.5;
            }
        }
    }
}