Hi Thorsten,
Yesterday I tested successfully the MIDI128 v3 with two button (optocoupler) matrix - with the INVERTED_DIN option. It was working fine. Many thanks for helping me, and implementing this feature.
Anyway I can reach the SD card in MSD mode, I can read the content, but when I try to save my changes in config file, it freezes the process. My system is Win7 64bit, and I think the GM5 driver causes this problem.
But anyway it is working fine now, so thanks a lot!!!
Best regards,
Marton