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You should use the right cable to connect the output from the Yamaha to the LINE IN of the Roland Duo-Capture, then the LINE OUT from the Roland to the LINE IN input on your PC's sound card ports, obviously.
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The ports on the Roland Duo-Capture model that I know about, are not USB, but rather, 1/32-inch audio type, or another type but not USB.
Please identify completely what 'Roland Duo-Capture' model you have. Is it a board plugged into a computer, or is it a device/box on its own?