Korg announced that they had a Development board for the Korg Prologue - which features a digital oscillator and effects chip. Korg recently announced that they would offer an SDK for the Prologue's digital aspects and this boafd allows you to code for the digital oscillator and the effects and test without having to own a Prologue.
Its not for sale, just available for interested developers who might want to expand that aspect of the Prologues features.
Its pretty serious stuff, you have 32k of memory to write your oscillator code in C so you might need to know what you are doing.
But in June the firmware update for the Prologue allows for the opening up of that part of the features - kind of extending the recent Korg hackable approach - remember those labeled points on the PCB for the volcas and 'tron products?
A very early preview of the upcoming filter and Envelope modules
Analog multi effect unit with real tape delay and oodles of dirty character
Limited edition black synth plus a new audio interface and four FX pedals
New 5 voice Cobalt Synth
Syntakt, Stuber Cherry Audio listening tests
String orchestra + classic synths = joy
A loving look at the life and work of a synth legend