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Another audio question

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Last Modified: 2015-03-12
I posted a question similar to this last week and thought I had the problem solved, but apparently not.

I have an external audio device I connect to my Windows 8.1 Inspiron 3847 desktop.  This is a Technics keyboard (actually taken over by Panasonic).  I connect it to my machine because I am a music notation copyist and use music software.

I have discovered that the USB device is only recognized by my system under certain conditions.  First of all, the device was made prior to USB 3.0 so I plug it into a USB 2.0 port.  But to my surprise, which USB 2.0 port I plug into make a difference.  That is, if I plug directly into a port located on the front or back of my machine, it will not work.  However, I have what I guess you call an extender four port USB hub. I plug it into one of the USB 2.0 ports of the computer and it gives me three additional USB 2.0 ports.  

For reasons unexplained, when I plug my audio device into it, it gets recognized. If I plug it into any of the other on-board USB 2.0 ports on the computer, it does not.  Go Figure?  The only thing I can think of that is different is that the extender,  has its own power supply.  The error message when plugging into ports (other than on the extender) says "The last USB device malfunctioned and windows does not recognize it.  

Anyone know what might be going on?
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