n0nx0x2 is an alternative firmware for the x0xb0x created by Anton Savov (antto). It requires installing a x0xlarge cpu upgrade.
Its basic design principle is recreating the original functionality and concepts of the Roland TB-303 sequencer, as no other clone had done this before.
Antto and many other people including myself are convinced that the sequencer is a crucial part of the orignal sound.
You can find more info about n0nx0x and other projects by antto on his website.
UPDATE: If you are interested in the above "303 style" alu frontpanel for n0nx0x2, you can order one now from the shop!