A new BLM has been born  Very nice to build, no big troubleshooting required if you are careful enough and don't forget a solder joint or create an unintended short. Andy deserves great respect for his sophisticated design, this is really professional work and sets a new DIY standard! Although the BLM16x16+X project is 5 years old meanwhile, you still can't buy a device with 290 buttons and duo-colour LEDs - you can only build it by yourself - and it has never been easier!  Best Regards