So, i was searching web to do additional keyboard, like around 20 buttons more, but did'nt found. So anyone know where to get schematics, and a program to bind keys to different commands? And dont say to buy keyboard with already extra buttons...
you will be better off buying a bigger keyboard unless you are into programming cpu rom chips that keyboards all have. it is not just a bunch of keys with wires connecting to each other but also ic's.