This video explains how to install custom oscillators to the Korg prologue’s MULTI ENGINE oscillator using the prologue Sound Librarian, available on the Korg website:
https://www.korg.com/us/support/download/product/0/778/#software
UK synth developer DirtSynthBox has created a Custom Oscillator for prologue, “Origami”, that is available for free for a limited time through their website.
https://www.korg.com/us/news/2018/121402/
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