XamarinでiOSのシステム音・バイブ機能を呼び出す

[assembly: Dependency(typeof(DeviceFunction))]
namespace hoge.iOS
{
    public class DeviceFunction : IDeviceFunction
    {
        private SystemSound _sound = null;
        private SystemSound _vibe = null;

        public void PlayVibrate()
        {
            if (_vibe == null)
            {
                _vibe = new SystemSound(1519);
            }
            _vibe.PlaySystemSound(); // サウンドと言いつつ振動する
        }

        public void PlayGoSound()
        {
            if (_sound == null)
            {
                _sound = new SystemSound(1104);
            }
            _sound.PlaySystemSound();
        }
}