What is the musical instrument being used in this song? (Not referring to the drums/percussion, or bass instruments) And if the sound was made electronically, what do I do to make it?

Question

I am trying to find this instrument being used so I can create an isolated remake of it without the other instruments since I couldn't find any good acapellas. I feel like it might be a stringed or key instrument but I can't tell.

Song file link:

https://drive.google.com/file/d/1E3HxB0aoLNnTaWrCx9cTxob8Yvuomtex/view

Answer 1

Sounds very much like a digital/software synth intended to be the string setting from a Mellotron, check out a similar sounding instrument here: https://www.youtube.com/watch?v=qMA-HfPMJSo

Also prominently featured in this King Crimson track: https://www.youtube.com/watch?v=ukgraQ-xkp4

Used on this Beatles song but not on the string setting: https://www.youtube.com/watch?v=ukgraQ-xkp4