namespace AudioToolbox
{
    public delegate void MusicSequenceUserCallback(MusicTrack track, double inEventTime, MusicEventUserData inEventData, double inStartSliceBeat, double inEndSliceBeat);
    {
        public virtual IAsyncResult BeginInvoke(MusicTrack track, double inEventTime, MusicEventUserData inEventData, double inStartSliceBeat, double inEndSliceBeat, AsyncCallback callback, object object);
    }
}