This is the sound of the oscillator from the Logan Melody 2 string synth from 1977, sampled to worn tape on 60s valve equipment, and synthesized with software samplers such as kontakt or esx24.
The idea is to emulate the sound of the mellotron or birotron, but to take it to the next level by being able to synthesize within software.
I've found some amazing sounding oscillators 'locked up' in these old keyboards that offer little if no synthesis possibilities.

tronsonic.com

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