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I have had this sound so long that it’s difficult to trace where it came from and how is was originally processed. I think it dates back to early in the year 2000. So, how does one deduce what the sound is and how it’s processed just by listening? Let me start by forgoing paranormal techniques. Although it sounds “creepy”, I’m guessing that I didn’t accidentally record ghosts eight years ago. 
I added some delay to spread the stereo spectrum on this synthesizer drone of a low frequency fifith interval. During the recording you can hear the cutoff frequency changing as I turned the knob for it. On my most often used synth, the Korg MS2000 that was used for this recording, the surface around the cutoff frequency knob has been polished smooth from wear. I use it much more frequently than the modulation wheel or pitch wheel. I love knobs. 
I bought this instrument for a bargain price at a music store quite some time ago. It’s an inexpensive Japanese made version of a melodica. They sound a lot like harmonicas, but has a keyboard to play the notes. Hohner makes the most popular versions of this instrument, but I really like the gravelly tone of this one that I recorded during a session on August 2, 2006. 
In January, 2008 I wrote about the sound design I had produced for an animated short film called