Yes... is that what I made... removed everything, just core, supply and midi, and tested directly to PIC pin 21, not even the socket... probe directly on its pin, and other on ground... then cycled the modulation 0,1,2,3: RD0, pin19, SO = Changes 0v-5v RD3, pin22, SC = Changes 0v-5V RD2, pin21, RC = always 0v And pin21 track is very free track, it just goes from pin 21 to J8/J9, like 1 centimeter of track (on core board) What do you think? Thanks again.