Dave,
I found lots of right angle USB adapters at
www.Cyberguys.com and they will solve the clearance problem with the stand. However, what I was trying to come up with is something that would allow the USB to remain plugged in all the time, similar to the PSR-3000s smart media card, which many users utilize like a small hard drive. It just stays in the slot and it is fully protected because it doesn't protrude out. Unfortunately, the Smart Media Card slot in the S-900 was not replaced with either a small hard drive, or some other form of card storage device with high capacity. The USB socket in the back of the keyboard was placed in a location that prevents any plug from being left in place because it would be damaged when the keyboard is placed inside the case.
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)