Sounds to me like a detuned organ with a lot of effects on it. You could probably get close to the same sound starting from ones of these and messing with the attack and adding reverb/delay/eqing:
https://presetshare.com/p8126
https://presetshare.com/p178
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https://presetshare.com/p8126
https://presetshare.com/p178