Aphex Microphone X - Manual (Page 4)

Go to Options-Monitoring and select Mixbus does monitoring.
Click the red circle (Track Arm) on your track.
You should now see signal on the input and output meters and hear yourself in
the Microphone X headphones when you turn up the headphone level.
Steinberg Cubase
Launching Cubase will bring up the Steinberg Hub.
Under Projects, select Empty.
Use the default location, name your new project and click Create.
Go to Devices-Device Setup.
Under VST Audio System, select Aphex ASIO from the drop down menu.
You will be prompted, “Do you want to switch driver?” Click Switch.
Set Audio Priority to Boost.
Uncheck ASIO-Guard.
Click Apply, then click OK.
Go to Devices-VST Connections.
Under Inputs, remove the current bus.
Click Add bus. Select Mono and click Add Bus.
Under Outputs, remove the current bus.
Click Add bus. Select Stereo and click Add Bus.
Exit the VST Connections Window.
Go to Project-Add Track-Audio. Select Mono and click Add Track.
Click the red circle (Track Arm) on your track.
Click on the Speaker icon.
You should now see signal on the input and output meters and hear yourself in
the Microphone X headphones when you turn up the headphone level.