Been looking at a few sites and I can’t find any that say the SD1000 can be powered by USB alone (Its purely used for Midi) but has to be used with the external power supply, (Remember the power output of USB 2 is very small) so it’s hardly surprising it doesn’t work correctly without the power supply.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).