Korg Prologue is a strange story, I have a Prologue 16 so I'm good, but I can't understand why they discontinued it. There was a rumour about some problems with a new EU law regarding electricity and that it had a transformer for its power that was not approved, and maybe they didn't sell enough of it.
However, it's ridiculous how bad it was marketed, sold as a polyphonic analogue synth, which is definitely not the full truth and made a lot if people ditch it as it wasn't considered to be up to par with other poly analogue synths on the market, while its real power is instead the unique hybrid thing, with the multi oscillator, making it a fabulous machine!
Though I don't understand Korg at all these days, it's like there is no marketing dept. and they just churn out everything they can assembly with the technology they have, without having a clue about what they're doing strategy wise.