From a practical point of view, this is the best solution, although theoretically it might be questionable. Actually, when you analyze the schematics, you’ll see that the build-in interface does not differ from most external interfaces: the decoded analog audio is actually converted to digital again in the USB Audio CODEC. There is nothing Icom specific in the USB part of the IC-7300. The Audio CODEC inside the IC-7300 does not requires a separate driver install. No need to install the Icom supplied driver. This driver is automatically installed when on Win8.1 or Win10. The SiLabs CP210x USB to UART (Serial Port) bridge chip inside the IC-7300 needs a driver.
