-Jidis Thank you for reply, but this work in MidiBox64 prog., which can use only 64 Buttons. I need 128 Buttons, it supports AIN 64 DIN 128 DOUT128(example) program, which is for me more simple, but it haven't part of code for lighting LEDs from incaming MIDI events. I don't know how to prog. :-[ Thnk for help LX