3. Set the input to USB on the front panel of the DT-309B.Connect the USB Cable from
your computer to the DT-309B USB input port.
from
http://www.mistralaudio.com/download_lists_535.html
On the opened webpage, choose "USB driver" under "Catagory",
Choose "DT-309B & HP-509 USB driver" under "Product Type",
Choose "CM6631A_WIN10-1.01" under "Product" if your system is WIN10,
Choose "CM6631A USB2.0 Driver v1.11" under "Product" if other windows system.
