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...as in Rhodes-like. (Reaktor 4).
It's pretty straight-forward: custom multi-sampled sounds are passed through a custom delay effect, either unaltered or after going through some simple math operations.
I built it in Reaktor 4. It works in R5.5 (the picture above is from 5.5) and so I assume it also works in 5.1.
v1.1: The "Volume" knob has been re-routed to a more sensible destination, and the snapshots have been updated to take advantage of this change.