There are many variablesinvolved. My method may not be available on your computer.
I can record streaming internet audio on the "Mono Out" setting found in the Otions>General >Input Channel list. Your computer may or may not have this device.
I found this by starting an internet stream then changed input channels until the meter indicated audio was present. I found that the Mono Out worked and in fact had to be set at a very low level to prevent over modulation.