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switch (room)

{

    case rm_dunes_18:

        if (instance_exists(obj_transition))

        {

            scr_audio_fade_out
scr_audio_fade_out

function scr_audio_fade_out(arg0, arg1)
{
    var snd = arg0;
    var fade_len = arg1;
    if (!audio_is_playing(snd))
        return false;
    audio_sound_gain(snd, 0, fade_len);
    if (instance_exists(obj_audio_fade_helper))
    {
        with (obj_audio_fade_helper)
        {
            if (audio_to_fade == snd)
                return false;
        }
    }
    with (instance_create(0, 0, obj_audio_fade_helper))
        audio_to_fade = snd;
}
(dynamic_song, 600);

            audio_sound_gain(current_song, 1, 400);

        }

        break;

}