You wanted an editor for your Mask1 keyboard or Mask1EX/MK2 module? GEOSynths, a professional sound designer, youtuber and programmer just released one for free. Click here to try it out in your browser. (It works on all webmidi-compatible browsers).
It also serves as a librarian. To see it in action, GEOSynths also made this video showing some excellent custom sounds:

Last Mask1EX MK2 "Jade Vine" Limited Edition units

Batch is almost sold out so consider ordering soon if you like it. No other batches will be made. Free shipping for EU orders / €39 for worldwide orders (except some very far locations) - Reduced custom fees for US customers.

Mask1EX works well with any controller and supports polyphonic aftertouch. 14 voice poly of innovative synthesis, with multi-timbrality, great built-in effects and a lot of memory to store presets and your own sounds.

Youtube is getting more and more videos of people making music with their Mask1. It is always a pleasure to see it in various setups. Well done everyone!