This one sounds in the mid octaves like a pad, in the higher octaves like a string and when you turn the attack to zero in the lower octaves like a bass.
Somewhere "off the shoulder of Orion" there is possibly a Haunted Spaceship. With possibly dead Replicants aboard. It might possibly sound like this... Work out on the VCF cutoff and peak and add a ton of reverb. And slide up and down the keys.
This is the lead from the Blade Runner opening track. It's played by Vangelis in E major with : E - F# - C# - B / E - F# - A - G# - F# - G# / B - C# - A# - F# - A - E. It sounds better with a chorus/reverb and no feedback ;)