timer++;
if (timer >= delay)
{
    if (init == 0)
    {
        if (global.plot >= plot && global.plot < highplot)
        {
            if (!snd_is_playing(global.currentsong[1]))
            {
                global.currentsong[0] = snd_init(song);
                global.currentsong[1] = mus_loop_ext(global.currentsong[0], volume, pitch);
                if (fadein != -1)
                {
                    snd_volume(global.currentsong[1], 0, 0);
                    snd_volume(global.currentsong[1], volume, fadein);
                }
            }
        }
        init = 1;
        instance_destroy();
    }
}