This is a creepy horror sound I wanted to recreate for one of my songs but could not. It is the opening sound you hear from Blood PC Game soundtrack, "Unholy Voices" track. You may find the soundtrack in this link
It is the sound just at the beginning of "Unholy Voices", which is the third track in the soundtrack (at the 5:56 mark). It is like a wind instrument. But it also has a bit string and vocal like qualities. I am not even sure if it can be replicated via a synthesizer. It probably is purely sample based.
In any case, your thoughts on it and any guidance would be much appreciated. Thanks in advance.