In RB go to Options-Preferences-Audio-Drivers button

Select the correct input driver .. sounds like you have the mic selected but expecting the USB to record.

There is also a Prefs button in recent versions to get there quicker.

To me it sounds like the wrong Audio Input Driver is selected.
After you select the correct one (Focusrite, which will likely require using ASIO Drivers) you should be able to record from that device. So in the Drivers area you may need to change from MME drivers to ASIO drivers to record the Focusrite USB signal. Most people have no problem when doing so.
If you do you can easily set it back to how it was.

The other option is to run an audio cable from the Focusrite's audio output to the computer's audio input ( again, the correct input Driver needs to be selected in RB, but in this scenario Windows may handle it for you), but if you go this route the quality of the Focusrite convertors is lost. Not the best option at all.


I do not work here, but the benefits are still awesome
Make your sound your own!