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The SRIO (J8/9) and J19 SPI require some sort of +5V, the source of which is selected by J5 (or SJ5). So the USB (power only) can be one of those sources, otherwise it can be regulated down from the Eurorack +12V or passed through the DB-25 cable, though I don't recommend the latter as the wires are quite thin and there will probably be a voltage drop.1 point