Zynthian is an opensource project. To get information on how to buy the official kit or build a DIY version like I did visit https://zynthian.org/ for more information. Zynthian is more than just a layer driven synthesizer that supports many sampled synthesizer engines. It also features support for the setBfree Organ emulator (sounds incredible) SFIZZ I have full control with my EWI and more . Check it out. Here are just a few songs I recorded with the Zynthian
This is what an EWI looks like. The fingering is a cross between a saxophone, recorder, and EWI..