The Leipzig-k keyboard design brief was simple. Design a keyboard in the true spirit of vintage keyboard monosynths. There is plenty of rack analogues and digital modelling keyboard synths around, but very few new true analogue keyboards.
Recently Analogue Solutions has released the Leipzig monosynth. It is a self contained TRUE analogue synthesiser. The voice circuitry is entirely analogue, using all discrete and op-amp components. There is no voice DSP. Leipzig has a similar sound and specification to the classic Moog Prodigy/Rogue synthesisers, but with many improvements such as MIDI and more modulation paths.