BIAS Head/Rack doesn't come with a separate ASIO driver, meaning that it's not possible to recognize BIAS Head/Rack as an audio interface/device in your DAW for recording.
Please always feed the signal physically from Line-Outputs on BIAS Head/Rack to input of your guitar audio interface to get it work. You can also track it directly with a dynamic/condenser/ribbon microphone.
Also, we suggest you to employ BIAS Amp2 Desktop Standalone version with the BIAS Head/Rack via USB to avoid any MIDI signal interferences from your DAW (Digital Audio Workstation).