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This page lists the know errors on the gm5x5x5 PCBs. ==== Prototype Run ==== === #1 MIDI IO pins === **Problem**: The MIDI IO pins of the midi sockets (Pin 4 + 5) are switched. **Solution**: Either (1) sse the pin-headers if you use sockets that are not mounted on the pcb or (2) break the traces to pins 4 + 5 of the sockets and solder wires to them.