For sure it is worth sharing @Signal11, it has value for me. Where did you find the API documentation for your Onkyo? Because as far as I know my OnkyoTX-NR616 doesn’t support the NetUSB Menu Title item, (or this item isn’t supported by the Onkyo binding). The channel is not detected (automatically). It has a NetUSB Menu Selected " item, which I used instead. And I can still navigate through the menu and the vTuner Internet radio channels.
This is what the your Onkyo NetUSB Controller looks like on the Onkyo TX-NR616.
