The Z1 is effectively the polyphonic successor to the Prophecy The Catch:
The Korg Z1 VST plugin boasts an impressive feature set that emulates its hardware counterpart: korg z1 vst
A long-running story in synth forums suggests the lead engineer who wrote the original Z1 firmware has passed away and the code was not adequately archived, making an accurate emulation extremely difficult and expensive. While Korg has never officially confirmed this, the persistent rumor does highlight the technical hurdle of emulating such a complex, multi-layered system. The Z1 is effectively the polyphonic successor to