source: OniSplit/Objects/Sound.cs@ 1144

using System;
using System.Xml;
using Oni.Xml;

namespace Oni.Objects
{
    internal class Sound : ObjectBase
    {
        public string ClassName;
        public float Volume = 1.0f;
        public float Pitch = 1.0f;
        public SoundVolumeType Type;
        public BoundingBox Box;
        public float MinDistance;
        public float MaxDistance;

        public Sound()
        {
            TypeId = ObjectType.Sound;
        }

        protected override void WriteOsd(BinaryWriter writer)
        {
            writer.Write(ClassName, 32);
            writer.Write((uint)Type);

            if (Type == SoundVolumeType.Box)
            {
                writer.Write(Box);
            }
            else
            {
                writer.Write(MinDistance);
                writer.Write(MaxDistance);
            }

            writer.Write(Volume);
            writer.Write(Pitch);
        }

        protected override void ReadOsd(BinaryReader reader)
        {
            ClassName = reader.ReadString(32);
            Type = (SoundVolumeType)reader.ReadInt32();

            if (Type == SoundVolumeType.Box)
            {
                Box = reader.ReadBoundingBox();
            }
            else if (Type == SoundVolumeType.Sphere)
            {
                MinDistance = reader.ReadSingle();
                MaxDistance = reader.ReadSingle();
            }

            Volume = reader.ReadSingle();
            Pitch = reader.ReadSingle();
        }

        protected override void ReadOsd(XmlReader xml, ObjectLoadContext context)
        {
            ClassName = xml.ReadElementContentAsString("Class", "");

            if (xml.IsStartElement("Volume"))
            {
                Volume = xml.ReadElementContentAsFloat("Volume", "");
                Pitch = xml.ReadElementContentAsFloat("Pitch", "");

                if (xml.IsStartElement("Box", ""))
                {
                    Type = SoundVolumeType.Box;
                    xml.ReadStartElement();
                    Box.Min = xml.ReadElementContentAsVector3("Min");
                    Box.Max = xml.ReadElementContentAsVector3("Max");
                    xml.ReadEndElement();
                }
                else
                {
                    Type = SoundVolumeType.Sphere;
                    xml.ReadStartElement("Spheres");
                    MinDistance = xml.ReadElementContentAsFloat("Min", "");
                    MaxDistance = xml.ReadElementContentAsFloat("Max", "");
                    xml.ReadEndElement();
                }
            }
            else
            {
                if (xml.IsStartElement("Box", ""))
                {
                    Type = SoundVolumeType.Box;
                    xml.ReadStartElement();
                    Box.Min = xml.ReadElementContentAsVector3("Min");
                    Box.Max = xml.ReadElementContentAsVector3("Max");
                    xml.ReadEndElement();
                }
                else
                {
                    Type = SoundVolumeType.Sphere;
                    xml.ReadStartElement("Sphere");
                    MinDistance = xml.ReadElementContentAsFloat("MinRadius", "");
                    MaxDistance = xml.ReadElementContentAsFloat("MaxRadius", "");
                    xml.ReadEndElement();
                }

                Volume = xml.ReadElementContentAsFloat("Volume", "");
                Pitch = xml.ReadElementContentAsFloat("Pitch", "");
            }
        }

        protected override void WriteOsd(XmlWriter xml)
        {
            throw new NotImplementedException();
        }
    }
}