Cwejman S1mk2 synthesiser

via this auction

"this S1mk2 was bought from Wowo Cwejman himself a little over 2 years ago. It's in impeccable, as new condition - not a scratch anywhere to be seen & has been kept in smoke free studio since day 1.
Some info about the machine..
The truth about the S1mk2 is that it is not a Moog, and even though the filters are Serge like and it can make Serge like sounds, it is not a Serge, though it leans more on that side of the fence, it is very different. Many people also say Cwejman sounds Roland like when Roland was building good stuff. It can come close to old Roland and Korg classics because it is so flexible, but the sound is much better than even the awesome old analog Roland and Korg classics. I like to say that the S1mk2 might sound like Roland's masterpiece if they kept advancing their analog synths all these years and never went digital.

The S1mk2 is a Cwejman though, and it sounds like a Cwejman. It very much has it's own sound. The S1mk2 is Wowa's masterpiece, which says a lot considering everything he builds is so amazing and unique. Every Cwejman creation is very much its own thing. When I think Cwejman S1mk2, I think of the blazing fast envelopes, that are not just fast but do what ever you ask of them, the best I have ever used, like the rest of the instrument, every part of it is near perfection. The vco's, the filters, the 68 front panel jacks being positioned all on the bottom. What you can do with those jacks, which are the best quality jacks around, not to mention the pots and knobs. The Modules are the only modules to have a board on the back to protect the important circuits from damage in case of a drop or something else. Something every module builder should add I think. His Modules have been protected against being powered wrong from the beginning, something yet to be a standard in euro but should be.

Running the S1mk2's lfo out as it's being modulated to death back into its self, or just patching any of the lfo's waves (the first sample and hold style waves being my favorite) into the gates and letting the S1 go nuts as I tweak the envelopes is also a very simple favorite, but fun, and always a pleasing thing to do with the S1.

Here's a little demo from another S1 I found on soundcloud.
S1 Love by Q960 The S1mk2 is really two amazing things in the same panel. Sequencing it from the back main input jacks or playing it with a keyboard using the same main cv and gate input, gives you control of 3 vco's, 2 filters, and a very powerful semi-modular monosynth feature set, similar but superior to the ARP 2600.
Better yet, you can ignore those two main input jacks on the back and patch into each and every individual module from the front, giving you independent control over every part of the S1mk2."